Wendy’s sneaky social media campaign was super creative and even more effective:“The effort, which promotes a new mid-size burger called the W, revolved around a game show on Twitter using the handle@GirlBehindSix. (The six referred to the open slot on Wendy’s menu, which would be filled by the new burger.) Although Wendy’s bought a Promoted Trend for one day on Twitter to publicize the account, the only other paid promotion was an ad that ran a few places on Sixth Avenue in New York and on the 6 subway line that described @GirlBehindSix as a ‘140-character game show.’ “Tags:#twittersocialmedia