Paranormal Activity 3 will be available on Blu-ray/DVD on January 24th, but you don't have to wait until then to see it at home. Paramount has announced Paranormal Activity: The Chronology, a digital download that presents all three films in chronological order as a seamless marathon:

"...Friday the 13th is turning out to be a lucky day for fans: In a first, all three films in the franchise will be available for Digital Download prior to the Blu-ray/DVD debut starting on January 13th. This unique experience, called Paranormal Activity: The Chronology, presents the films in chronological order as a seamless marathon." Here’s a look:

Paranormal Activity: The Chronology is now available on multiple digital download services, including iTunes: http://itunes.apple.com/us/movie/paranormal-activity-the-chronology/id493840558?ign-mpt=uo%3D2

Bloody Mary…Bloody Mary…Blood…In anticipation of the Blu-ray and DVD debut of the record-breaking, blockbuster hit Paranormal Activity 3 on January 24th, Paramount Home Media Distribution is inviting fans to get into the proper state of mind by daring them to a game of “Bloody Mary.” As darkness falls on Friday, the 13th of January, fans can summon the eerie presence and then post about their experience on the film’s Facebook or Twitter page. Demonstrated to terrifying effect in the film, the game is played by turning off the lights and saying “Bloody Mary” three times into a bathroom mirror. To get you further inspired for the dare, here is a clip from the Blu-ray/DVD combo pack, that includes both the theatrical version of the film and an unrated version with footage not seen in theaters, as well as Lost Tapes that reveal more footage :