Untraceable

Robert Fyvolent (screenplay), Mark Brinker (screenplay) (as Mark R. Brinker) 2008

IMDB: http://www.imdb.com/title/tt0880578/

FBI agent Jennifer Marsh is tasked with hunting down a seemingly untraceable serial killer who posts live videos of his victims on the Internet. As time runs out, the cat and mouse chase becomes more personal.