Links go to Google Play, but Apple iPhone apps available too

Facebook (Messenger)

Path (like facebook)

Twitter

Kik (Texting)

Instagram (photo sharing)

SnapChat (and video)

Tinder (reciprocating match maker)

Hot or Not (rate me app)

Yik Yak (should be blocked on school campus)

Vine (6 second videos)

Youtube (video sharing)

OoVoo (video chat)

Fling (anonymous)

Ask.fm (fessions)

Chat Roulette (anonymous chat and video)

Omegle (anonymous chat and video)

MeetMe (anonymous chat and video)

Jott (defeats wifi, allows chat rooms through bluetooth)