diff --git a/common/group.ts b/common/group.ts
index 15348d5a..e367ded7 100644
--- a/common/group.ts
+++ b/common/group.ts
@@ -11,8 +11,11 @@ export type Group = {
   contractIds: string[]
 
   chatDisabled?: boolean
+  mostRecentChatActivityTime?: number
+  mostRecentContractAddedTime?: number
 }
 export const MAX_GROUP_NAME_LENGTH = 75
 export const MAX_ABOUT_LENGTH = 140
 export const MAX_ID_LENGTH = 60
 export const NEW_USER_GROUP_SLUGS = ['updates', 'bugs', 'welcome']
+export const GROUP_CHAT_SLUG = 'chat'
diff --git a/functions/src/create-notification.ts b/functions/src/create-notification.ts
index 1fb6c3af..4c42b00e 100644
--- a/functions/src/create-notification.ts
+++ b/functions/src/create-notification.ts
@@ -15,11 +15,11 @@ import { Answer } from '../../common/answer'
 import { getContractBetMetrics } from '../../common/calculate'
 import { removeUndefinedProps } from '../../common/util/object'
 import { TipTxn } from '../../common/txn'
-import { Group } from '../../common/group'
+import { Group, GROUP_CHAT_SLUG } from '../../common/group'
 const firestore = admin.firestore()
 
 type user_to_reason_texts = {
-  [userId: string]: { reason: notification_reason_types; isSeeOnHref?: string }
+  [userId: string]: { reason: notification_reason_types }
 }
 
 export const createNotification = async (
@@ -72,7 +72,6 @@ export const createNotification = async (
           sourceContractSlug: sourceContract?.slug,
           sourceSlug: sourceSlug ? sourceSlug : sourceContract?.slug,
           sourceTitle: sourceTitle ? sourceTitle : sourceContract?.question,
-          isSeenOnHref: userToReasonTexts[userId].isSeeOnHref,
         }
         await notificationRef.set(removeUndefinedProps(notification))
       })
@@ -277,17 +276,6 @@ export const createNotification = async (
     }
   }
 
-  const notifyOtherGroupMembersOfComment = async (
-    userToReasons: user_to_reason_texts,
-    userId: string
-  ) => {
-    if (shouldGetNotification(userId, userToReasons))
-      userToReasons[userId] = {
-        reason: 'on_group_you_are_member_of',
-        isSeeOnHref: sourceSlug,
-      }
-  }
-
   const getUsersToNotify = async () => {
     const userToReasonTexts: user_to_reason_texts = {}
     // The following functions modify the userToReasonTexts object in place.
@@ -298,8 +286,6 @@ export const createNotification = async (
         await notifyUserAddedToGroup(userToReasonTexts, relatedUserId)
     } else if (sourceType === 'user' && relatedUserId) {
       await notifyUserReceivedReferralBonus(userToReasonTexts, relatedUserId)
-    } else if (sourceType === 'comment' && !sourceContract && relatedUserId) {
-      await notifyOtherGroupMembersOfComment(userToReasonTexts, relatedUserId)
     }
 
     // The following functions need sourceContract to be defined.
@@ -417,3 +403,34 @@ export const createBetFillNotification = async (
   }
   return await notificationRef.set(removeUndefinedProps(notification))
 }
+
+export const createGroupCommentNotification = async (
+  fromUser: User,
+  toUserId: string,
+  comment: Comment,
+  group: Group,
+  idempotencyKey: string
+) => {
+  const notificationRef = firestore
+    .collection(`/users/${toUserId}/notifications`)
+    .doc(idempotencyKey)
+  const sourceSlug = `/group/${group.slug}/${GROUP_CHAT_SLUG}`
+  const notification: Notification = {
+    id: idempotencyKey,
+    userId: toUserId,
+    reason: 'on_group_you_are_member_of',
+    createdTime: Date.now(),
+    isSeen: false,
+    sourceId: comment.id,
+    sourceType: 'comment',
+    sourceUpdateType: 'created',
+    sourceUserName: fromUser.name,
+    sourceUserUsername: fromUser.username,
+    sourceUserAvatarUrl: fromUser.avatarUrl,
+    sourceText: comment.text,
+    sourceSlug,
+    sourceTitle: `${group.name}`,
+    isSeenOnHref: sourceSlug,
+  }
+  await notificationRef.set(removeUndefinedProps(notification))
+}
diff --git a/functions/src/on-create-comment-on-group.ts b/functions/src/on-create-comment-on-group.ts
index 7217e602..0064480f 100644
--- a/functions/src/on-create-comment-on-group.ts
+++ b/functions/src/on-create-comment-on-group.ts
@@ -3,7 +3,7 @@ import { Comment } from '../../common/comment'
 import * as admin from 'firebase-admin'
 import { Group } from '../../common/group'
 import { User } from '../../common/user'
-import { createNotification } from './create-notification'
+import { createGroupCommentNotification } from './create-notification'
 const firestore = admin.firestore()
 
 export const onCreateCommentOnGroup = functions.firestore
@@ -29,23 +29,17 @@ export const onCreateCommentOnGroup = functions.firestore
 
     const group = groupSnapshot.data() as Group
     await firestore.collection('groups').doc(groupId).update({
-      mostRecentActivityTime: comment.createdTime,
+      mostRecentChatActivityTime: comment.createdTime,
     })
 
     await Promise.all(
       group.memberIds.map(async (memberId) => {
-        return await createNotification(
-          comment.id,
-          'comment',
-          'created',
+        return await createGroupCommentNotification(
           creatorSnapshot.data() as User,
-          eventId,
-          comment.text,
-          undefined,
-          undefined,
           memberId,
-          `/group/${group.slug}`,
-          `${group.name}`
+          comment,
+          group,
+          eventId
         )
       })
     )
diff --git a/functions/src/on-update-group.ts b/functions/src/on-update-group.ts
index feaa6443..3ab2a249 100644
--- a/functions/src/on-update-group.ts
+++ b/functions/src/on-update-group.ts
@@ -12,7 +12,15 @@ export const onUpdateGroup = functions.firestore
     // ignore the update we just made
     if (prevGroup.mostRecentActivityTime !== group.mostRecentActivityTime)
       return
-    // TODO: create notification with isSeeOnHref set to the group's /group/questions url
+
+    if (prevGroup.contractIds.length < group.contractIds.length) {
+      await firestore
+        .collection('groups')
+        .doc(group.id)
+        .update({ mostRecentContractAddedTime: Date.now() })
+      //TODO: create notification with isSeeOnHref set to the group's /group/slug/questions url
+      // but first, let the new /group/slug/chat notification permeate so that we can differentiate between the two
+    }
 
     await firestore
       .collection('groups')
diff --git a/web/components/groups/groups-button.tsx b/web/components/groups/groups-button.tsx
index f3ae77a2..b510f44d 100644
--- a/web/components/groups/groups-button.tsx
+++ b/web/components/groups/groups-button.tsx
@@ -17,7 +17,9 @@ import toast from 'react-hot-toast'
 export function GroupsButton(props: { user: User }) {
   const { user } = props
   const [isOpen, setIsOpen] = useState(false)
-  const groups = useMemberGroups(user.id)
+  const groups = useMemberGroups(user.id, undefined, {
+    by: 'mostRecentChatActivityTime',
+  })
 
   return (
     <>
diff --git a/web/components/nav/sidebar.tsx b/web/components/nav/sidebar.tsx
index 1ff59275..baa60719 100644
--- a/web/components/nav/sidebar.tsx
+++ b/web/components/nav/sidebar.tsx
@@ -24,7 +24,7 @@ import { CreateQuestionButton } from 'web/components/create-question-button'
 import { useMemberGroups } from 'web/hooks/use-group'
 import { groupPath } from 'web/lib/firebase/groups'
 import { trackCallback, withTracking } from 'web/lib/service/analytics'
-import { Group } from 'common/group'
+import { Group, GROUP_CHAT_SLUG } from 'common/group'
 import { Spacer } from '../layout/spacer'
 import { useUnseenPreferredNotifications } from 'web/hooks/use-notifications'
 import { setNotificationsAsSeen } from 'web/pages/notifications'
@@ -198,10 +198,14 @@ export default function Sidebar(props: { className?: string }) {
     ? signedOutMobileNavigation
     : signedInMobileNavigation
   const memberItems = (
-    useMemberGroups(user?.id, { withChatEnabled: true }) ?? []
+    useMemberGroups(
+      user?.id,
+      { withChatEnabled: true },
+      { by: 'mostRecentChatActivityTime' }
+    ) ?? []
   ).map((group: Group) => ({
     name: group.name,
-    href: groupPath(group.slug),
+    href: `${groupPath(group.slug)}/${GROUP_CHAT_SLUG}`,
   }))
 
   return (
@@ -282,8 +286,16 @@ function GroupsList(props: {
 
   // Set notification as seen if our current page is equal to the isSeenOnHref property
   useEffect(() => {
+    const currentPageGroupSlug = currentPage.split('/')[2]
     preferredNotifications.forEach((notification) => {
-      if (notification.isSeenOnHref === currentPage) {
+      if (
+        notification.isSeenOnHref === currentPage ||
+        // Old chat style group chat notif ended just with the group slug
+        notification.isSeenOnHref?.endsWith(currentPageGroupSlug) ||
+        // They're on the home page, so if they've a chat notif, they're seeing the chat
+        (notification.isSeenOnHref?.endsWith(GROUP_CHAT_SLUG) &&
+          currentPage.endsWith(currentPageGroupSlug))
+      ) {
         setNotificationsAsSeen([notification])
       }
     })
diff --git a/web/components/user-page.tsx b/web/components/user-page.tsx
index be3f3ac4..85d70e86 100644
--- a/web/components/user-page.tsx
+++ b/web/components/user-page.tsx
@@ -38,6 +38,7 @@ import { GroupsButton } from 'web/components/groups/groups-button'
 import { PortfolioValueSection } from './portfolio/portfolio-value-section'
 import { filterDefined } from 'common/util/array'
 import { useUserBets } from 'web/hooks/use-user-bets'
+import { ReferralsButton } from 'web/components/referrals-button'
 
 export function UserLink(props: {
   name: string
@@ -202,7 +203,9 @@ export function UserPage(props: {
           <Row className="gap-4">
             <FollowingButton user={user} />
             <FollowersButton user={user} />
-            {/* <ReferralsButton user={user} currentUser={currentUser} /> */}
+            {currentUser?.username === 'Ian' && (
+              <ReferralsButton user={user} currentUser={currentUser} />
+            )}
             <GroupsButton user={user} />
           </Row>
 
diff --git a/web/hooks/use-group.ts b/web/hooks/use-group.ts
index c3098ba4..4f968005 100644
--- a/web/hooks/use-group.ts
+++ b/web/hooks/use-group.ts
@@ -32,19 +32,26 @@ export const useGroups = () => {
 
 export const useMemberGroups = (
   userId: string | null | undefined,
-  options?: { withChatEnabled: boolean }
+  options?: { withChatEnabled: boolean },
+  sort?: { by: 'mostRecentChatActivityTime' | 'mostRecentContractAddedTime' }
 ) => {
   const [memberGroups, setMemberGroups] = useState<Group[] | undefined>()
   useEffect(() => {
     if (userId)
-      return listenForMemberGroups(userId, (groups) => {
-        if (options?.withChatEnabled)
-          return setMemberGroups(
-            filterDefined(groups.filter((group) => group.chatDisabled !== true))
-          )
-        return setMemberGroups(groups)
-      })
-  }, [options?.withChatEnabled, userId])
+      return listenForMemberGroups(
+        userId,
+        (groups) => {
+          if (options?.withChatEnabled)
+            return setMemberGroups(
+              filterDefined(
+                groups.filter((group) => group.chatDisabled !== true)
+              )
+            )
+          return setMemberGroups(groups)
+        },
+        sort
+      )
+  }, [options?.withChatEnabled, sort, userId])
   return memberGroups
 }
 
@@ -88,7 +95,7 @@ export async function listMembers(group: Group, max?: number) {
   const { memberIds } = group
   const numToRetrieve = max ?? memberIds.length
   if (memberIds.length === 0) return []
-  if (numToRetrieve)
+  if (numToRetrieve > 100)
     return (await getUsers()).filter((user) =>
       group.memberIds.includes(user.id)
     )
diff --git a/web/lib/firebase/groups.ts b/web/lib/firebase/groups.ts
index 6d695b7f..e49b012a 100644
--- a/web/lib/firebase/groups.ts
+++ b/web/lib/firebase/groups.ts
@@ -7,7 +7,7 @@ import {
   where,
 } from 'firebase/firestore'
 import { sortBy, uniq } from 'lodash'
-import { Group } from 'common/group'
+import { Group, GROUP_CHAT_SLUG } from 'common/group'
 import { updateContract } from './contracts'
 import {
   coll,
@@ -22,7 +22,7 @@ export const groups = coll<Group>('groups')
 
 export function groupPath(
   groupSlug: string,
-  subpath?: 'edit' | 'questions' | 'about' | 'chat' | 'rankings'
+  subpath?: 'edit' | 'questions' | 'about' | typeof GROUP_CHAT_SLUG | 'rankings'
 ) {
   return `/group/${groupSlug}${subpath ? `/${subpath}` : ''}`
 }
@@ -62,12 +62,21 @@ export function listenForGroup(
 
 export function listenForMemberGroups(
   userId: string,
-  setGroups: (groups: Group[]) => void
+  setGroups: (groups: Group[]) => void,
+  sort?: { by: 'mostRecentChatActivityTime' | 'mostRecentContractAddedTime' }
 ) {
   const q = query(groups, where('memberIds', 'array-contains', userId))
-
+  const sorter = (group: Group) => {
+    if (sort?.by === 'mostRecentChatActivityTime') {
+      return group.mostRecentChatActivityTime ?? group.mostRecentActivityTime
+    }
+    if (sort?.by === 'mostRecentContractAddedTime') {
+      return group.mostRecentContractAddedTime ?? group.mostRecentActivityTime
+    }
+    return group.mostRecentActivityTime
+  }
   return listenForValues<Group>(q, (groups) => {
-    const sorted = sortBy(groups, [(group) => -group.mostRecentActivityTime])
+    const sorted = sortBy(groups, [(group) => -sorter(group)])
     setGroups(sorted)
   })
 }
diff --git a/web/pages/group/[...slugs]/index.tsx b/web/pages/group/[...slugs]/index.tsx
index a364de43..3fa64964 100644
--- a/web/pages/group/[...slugs]/index.tsx
+++ b/web/pages/group/[...slugs]/index.tsx
@@ -1,6 +1,6 @@
 import { take, sortBy, debounce } from 'lodash'
 
-import { Group } from 'common/group'
+import { Group, GROUP_CHAT_SLUG } from 'common/group'
 import { Page } from 'web/components/page'
 import { listAllBets } from 'web/lib/firebase/bets'
 import { Contract, listContractsByGroupSlug } from 'web/lib/firebase/contracts'
@@ -21,7 +21,7 @@ import {
 } from 'web/lib/firebase/users'
 import { Col } from 'web/components/layout/col'
 import { useUser } from 'web/hooks/use-user'
-import { listMembers, useGroup } from 'web/hooks/use-group'
+import { listMembers, useGroup, useMembers } from 'web/hooks/use-group'
 import { useRouter } from 'next/router'
 import { scoreCreators, scoreTraders } from 'common/scoring'
 import { Leaderboard } from 'web/components/leaderboard'
@@ -114,7 +114,7 @@ export async function getStaticPaths() {
 }
 const groupSubpages = [
   undefined,
-  'chat',
+  GROUP_CHAT_SLUG,
   'questions',
   'rankings',
   'about',
@@ -218,7 +218,7 @@ export default function GroupPage(props: {
             ) : (
               <LoadingIndicator />
             ),
-            href: groupPath(group.slug, 'chat'),
+            href: groupPath(group.slug, GROUP_CHAT_SLUG),
           },
         ]),
     {
@@ -246,7 +246,7 @@ export default function GroupPage(props: {
       href: groupPath(group.slug, 'about'),
     },
   ]
-  const tabIndex = tabs.map((t) => t.title).indexOf(page ?? 'chat')
+  const tabIndex = tabs.map((t) => t.title).indexOf(page ?? GROUP_CHAT_SLUG)
   return (
     <Page rightSidebar={rightSidebar} className="!pb-0">
       <SEO
@@ -403,7 +403,7 @@ function GroupOverview(props: {
           </Row>
         )}
         <Col className={'mt-2'}>
-          <GroupMemberSearch members={members} />
+          <GroupMemberSearch members={members} group={group} />
         </Col>
       </Col>
     </>
@@ -426,9 +426,16 @@ function SearchBar(props: { setQuery: (query: string) => void }) {
   )
 }
 
-function GroupMemberSearch(props: { members: User[] }) {
+function GroupMemberSearch(props: { members: User[]; group: Group }) {
   const [query, setQuery] = useState('')
-  const { members } = props
+  const { group } = props
+  let { members } = props
+
+  // Use static members on load, but also listen to member changes:
+  const listenToMembers = useMembers(group)
+  if (listenToMembers) {
+    members = listenToMembers
+  }
 
   // TODO use find-active-contracts to sort by?
   const matches = sortBy(members, [(member) => member.name]).filter(
diff --git a/web/pages/groups.tsx b/web/pages/groups.tsx
index 2523b789..87ac1501 100644
--- a/web/pages/groups.tsx
+++ b/web/pages/groups.tsx
@@ -79,7 +79,11 @@ export default function Groups(props: {
   )
 
   const matchesOrderedByRecentActivity = sortBy(groups, [
-    (group) => -1 * group.mostRecentActivityTime,
+    (group) =>
+      -1 *
+      (group.mostRecentChatActivityTime ??
+        group.mostRecentContractAddedTime ??
+        group.mostRecentActivityTime),
   ]).filter(
     (g) =>
       checkAgainstQuery(query, g.name) ||