Demi Lovato Challenges Fans To #UnlockHeartAttack On Twitter [LYRIC VIDEO]

For the release of Demi Lovato's "Heart Attack" lyric video, the singer tried a unique approach to get her fans engaged and in the process, managed to get herself a worldwide trending topic on Twitter! Earlier on Friday, Demi tweeted:

The link to her website challenged fans to tweet the lyrics to "Heart Attack" enough times in order to unlock the lyric video. The interactive lyrics sheet on her site shows exactly how many times each word had been tweeted in total — pretty amazing! See the unlocked lyric video:

What do you think of the lyric video? Tell us in the comments!