On Mojo, you start friends with everyone in your university and reduce to a core group of compatible friends.
The more you use Mojo, the more the app learns about you and who would be your ideal friends, presenting the most compatible to you in a series of cuts.
In the meantime, learn about your entire class, see who is free to hangout, and follow what your friends are up to on campus. Update your status to find others who are hungry for lunch or join the recommended events Mojo pushes to you and similar users.