New Yorkers walking down 6th Avenue or riding the 6 subway line may have been baffled at first by recent mysterious ads for @GirlBehindSix, which described it as a “140-character game show.” But that simple promotion, plus a one-day Promoted Trend on Twitter, generated 33,000 followers for @GirlBehindSix, which was a front for the promotion of a new burger at the Wendy’s fast-food restaurant chain. Read →