Earlier this month, "The X Factor" became the first-ever reality-TV competition show to allow voting by Twitter. (See "How to Vote for Your Favorite Act on The X Factor" in the Twitter Help Center.) What's that done for its social-TV footprint? Ad Age asked our editorial partner Bluefin Labs, a Cambridge-Mass.-based social-media analytics company that specializes in social TV, to give us a view into the data it's been collecting on the show all season. Some notes about the charts below.... Read more.