On the top of your Baazline you will see avatars of your accounts from Baaz, Facebook, Twitter and YouTube (if you have connected your accounts from these networks). The avatars serve as filters for these accounts when you click them.
Baaz filter is active by default. Selecting other filters will show you social feeds from your other accounts:
Tweets from the people you follow on Twitter.
Posts from your Facebook timeline, i.e. from your Facebook profile.
Videos from your YouTube subscriptions.