What can I do with my profile contacts?

What can I do with my contacts? I have over 700 of them and would like to know what I am supposed to do with them besides look at the cool and interesting avatars and pages. Is it possible to contacts them all? Or is that not possible? I think MBL is awsome, but i am not sure what the intended purpose and what the use is for the contacts in my profile.

Any advice would be appreciated, thanks.