When you are signed in to social networking services through the Social app, you can see your friends' status updates from all those services in a single view. You do not have to switch between different apps to see what everyone is up to.
Select > Social.
Select a service, then sign in.
Select > My Accounts > Add social network.
Select another service, then sign in.
Select > All Activity.
All the feeds from the services you have added are automatically included in the view.