diff --git a/common/djangoapps/django_comment_common/signals.py b/common/djangoapps/django_comment_common/signals.py
index 36d75a87ab..e8ae64e2ba 100644
--- a/common/djangoapps/django_comment_common/signals.py
+++ b/common/djangoapps/django_comment_common/signals.py
@@ -7,6 +7,8 @@ thread_created = Signal(providing_args=['user', 'post'])
 thread_edited = Signal(providing_args=['user', 'post'])
 thread_voted = Signal(providing_args=['user', 'post'])
 thread_deleted = Signal(providing_args=['user', 'post'])
+thread_followed = Signal(providing_args=['user', 'post'])
+thread_unfollowed = Signal(providing_args=['user', 'post'])
 comment_created = Signal(providing_args=['user', 'post'])
 comment_edited = Signal(providing_args=['user', 'post'])
 comment_voted = Signal(providing_args=['user', 'post'])
diff --git a/lms/djangoapps/django_comment_client/base/tests.py b/lms/djangoapps/django_comment_client/base/tests.py
index a3de71fe29..4fccc7a993 100644
--- a/lms/djangoapps/django_comment_client/base/tests.py
+++ b/lms/djangoapps/django_comment_client/base/tests.py
@@ -510,6 +510,23 @@ class ViewsTestCase(
         # create_thread_helper verifies that extra data are passed through to the comments service
         self.create_thread_helper(mock_request, extra_response_data={'context': ThreadContext.STANDALONE})
 
+    @ddt.data(
+        ('follow_thread', 'thread_followed'),
+        ('unfollow_thread', 'thread_unfollowed'),
+    )
+    @ddt.unpack
+    def test_follow_unfollow_thread_signals(self, view_name, signal, mock_request):
+        self.create_thread_helper(mock_request)
+
+        with self.assert_discussion_signals(signal):
+            response = self.client.post(
+                reverse(
+                    view_name,
+                    kwargs={"course_id": unicode(self.course_id), "thread_id": 'i4x-MITx-999-course-Robot_Super_Course'}
+                )
+            )
+        self.assertEqual(response.status_code, 200)
+
     def test_delete_thread(self, mock_request):
         self._set_mock_request_data(mock_request, {
             "user_id": str(self.student.id),
diff --git a/lms/djangoapps/django_comment_client/base/views.py b/lms/djangoapps/django_comment_client/base/views.py
index 6fdf23f81e..c937d44f35 100644
--- a/lms/djangoapps/django_comment_client/base/views.py
+++ b/lms/djangoapps/django_comment_client/base/views.py
@@ -42,7 +42,9 @@ from django_comment_common.signals import (
     thread_created,
     thread_deleted,
     thread_edited,
-    thread_voted
+    thread_voted,
+    thread_followed,
+    thread_unfollowed,
 )
 from django_comment_common.utils import ThreadContext
 import eventtracking
@@ -291,6 +293,7 @@ def create_thread(request, course_id, commentable_id):
     if follow:
         cc_user = cc.User.from_django_user(user)
         cc_user.follow(thread)
+        thread_followed.send(sender=None, user=user, post=thread)
 
     data = thread.to_dict()
 
@@ -525,6 +528,7 @@ def _vote_or_unvote(request, course_id, obj, value='up', undo_vote=False):
         # (People could theoretically downvote by handcrafting AJAX requests.)
     else:
         user.vote(obj, value)
+    thread_voted.send(sender=None, user=request.user, post=obj)
     track_voted_event(request, course, obj, value, undo_vote)
     return JsonResponse(prepare_content(obj.to_dict(), course_key))
 
@@ -563,7 +567,6 @@ def vote_for_thread(request, course_id, thread_id, value):
     """
     thread = cc.Thread.find(thread_id)
     result = _vote_or_unvote(request, course_id, thread, value)
-    thread_voted.send(sender=None, user=request.user, post=thread)
     return result
 
 
@@ -689,6 +692,7 @@ def follow_thread(request, course_id, thread_id):
     user = cc.User.from_django_user(request.user)
     thread = cc.Thread.find(thread_id)
     user.follow(thread)
+    thread_followed.send(sender=None, user=request.user, post=thread)
     return JsonResponse({})
 
 
@@ -717,6 +721,7 @@ def unfollow_thread(request, course_id, thread_id):
     user = cc.User.from_django_user(request.user)
     thread = cc.Thread.find(thread_id)
     user.unfollow(thread)
+    thread_unfollowed.send(sender=None, user=request.user, post=thread)
     return JsonResponse({})
 
 
diff --git a/lms/djangoapps/teams/models.py b/lms/djangoapps/teams/models.py
index 154f424acd..f0398bc2b1 100644
--- a/lms/djangoapps/teams/models.py
+++ b/lms/djangoapps/teams/models.py
@@ -21,7 +21,9 @@ from django_comment_common.signals import (
     thread_created,
     thread_deleted,
     thread_edited,
-    thread_voted
+    thread_voted,
+    thread_followed,
+    thread_unfollowed,
 )
 from lms.djangoapps.teams import TEAM_DISCUSSION_CONTEXT
 from lms.djangoapps.teams.utils import emit_team_event
@@ -42,6 +44,14 @@ def post_create_vote_handler(sender, **kwargs):  # pylint: disable=unused-argume
     handle_activity(kwargs['user'], kwargs['post'])
 
 
+@receiver(thread_followed)
+@receiver(thread_unfollowed)
+def post_followed_unfollowed_handler(sender, **kwargs):  # pylint: disable=unused-argument
+    """Update the user's last activity date upon followed or unfollowed of a
+    post."""
+    handle_activity(kwargs['user'], kwargs['post'])
+
+
 @receiver(thread_edited)
 @receiver(thread_deleted)
 @receiver(comment_edited)