ABC Family's "Pretty Little Liars" has proven to be a social media hit, with the most recent season's cliffhanger finale being the first TV-series episode to generate more than 1 million tweets during its first screening. "It has a lot of unique elements that set it up for success in the social media space: an ongoing mystery, plot twists and turns, cliffhangers and what we call OMG moments," says ABC Family's Danielle Mullin.

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