The L.A. Times
http://latimesblogs.latimes.com/movies/2011/06/black-swan-xoxo-facebook-mark-heyman-darren-aronofsky-nina-lily.html
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According to The L.A. Times, XOXO, written by Black Swan writer Mark Heyman, who is co-producing with Darren Aronofsky, tells of a twentysomething man who meets a female contemporary on Facebook and begins a digital relationship with her, only to find the object of his affections take the relationship to an obsessed and stalker-y place. Think Fatal Attraction (but with Facebook).
XOXO, which makes use of streaming video and other social-media platforms in addition to Facebook, also evokes the documentary Catfish in its exploration of slippery digital identities. (The letter-centric title is, of course, a reference to affectionate, and potentially creepy, online sign-offs.)
The script is now being circulated in Hollywood, including to numerous genre labels, as it seeks financing and distribution.