First slide – every day used apps.
Second slide – the rest.

That’s right, the Facebook app is on the second page.

Some of the 3rd apps:
Camera+ – I like it for its burst and stabilizator mode, that helps to take pictures in bad light conditions.
Week Calendar – cheap and extremely powerful calendar. If you are using Google Calendar, I think this is must-have.
Tweetbot – beautiful Twitter client.
Awesome Note – my to-do client.