All of it on the kik smartphone application, with no real names for any of the participants and all out of the school's control.
The recipient can buy clues (like the sender's gender or where they go to school) to try to guess the sender.
It is not as anonymous as other apps, since it is connected to Facebook or a Google account.
How it is misused: This service is filled with adults searching for sexual chat.
Some prefer to do so live; others offer children links to porn websites; and since the chats are anonymous, they're often much more explicit.
Impossible to verify the identity of someone on kik.