When commenting your friend's status is not enough, you can call or send a message to the friend.
Select > Social.
Select a friend's profile picture, then select the communication method.
This feature is available if you have linked your online friends to their contact info in your phone, or if your friends have added their own contact info to their details in the service.
The available communication methods vary. To call or send a text message to a friend, the feature needs to be supported by the service.