Overshare

[Gareth Branwyn]

Last night, at a gathering of friends, the conversation turned to a rather
personal nature and one of the participants blurted out "overshare!"
Apparently, it's used in "Bring it On," the new cheerleader movie with
Kirsten Dunst.

A quick Web search finds that it was not made up for the film, but it's not
something that I've heard before. Anyone else? Is this widely used teen
slang?