Follow colleagues to get updates whenever they post to their wall. Click on the profile of the person you want to follow, and click the green + by their profile picture (Figure 1):
Figure 1 Follow
It will turn into a check mark when you’re following them and you will receive a notification under Signals in the left a nav whenever they post. Click Context or the user's profile to view the wall post. Click again to unfollow them (indicated by the green +).