Electronic Hip Hop DJ & Produce Diplo produced "Express Yourself" which was released in May and the video features women shaking their azzes back ground forth. 

Diplo then started a Twitter campaign in which he asked followers to tweet impressive pictures of themselves "Expressing" themselves. The hashtag racked up around 25,000 tweets and 15 lucky winners now have access to a lifetime guestlist access to all of his show. Winner pictures here. 
They also produced a youtube video with some of the best #Expressyourself entries.
 

Diplo definitely has special ways of interacting with fans!

Support him on Facebook at: http://www.facebook.com/diplo
Support him on Twitter at: https://twitter.com/diplo