IMDB: http://www.imdb.com/title/tt1147684/
Trailer: http://www.traileraddict.com/trailer...me-not/trailer

It's graduation weekend, and Sandy Channing, the popular class president of her small-town high school, should be enjoying the time of her life. But when her friends start disappearing, Sandy discovers they have unwittingly awakened the vengeful spirit of a girl they wronged long ago. Fighting for her sanity, Sandy must unlock a dark secret from her own past before it's too late.
7.5/10

Good plot, not to slow, keeps you guessing. Teenish movie.