The activity bar at the top of your screen notifies you of current activities from content producers and other users you follow.
Shown in the activity bar are..
1. Wall post. Anytime a new wall post or any replies on any wall of content producers or contacts you follow will show up on the activity bar
2. Content updates. Any new content or updates to content will show up on the activity bar
3. Broadcasting. Any time someone starts a broadcast it will show up on the activity bar
4. Store updates. Any new store updates will show up on the activity bar
as a user updates you to the activities that friends and content producers