Following today's announcement of the Mad Decent Block Party line-up many of you may have wondered the identity of one of the featuring acts, Jack U.\r \r Diplo cleared it up in a a concise tweet announcing that "Jack U...Means Skrillex + Diplo together."\r \r Well there you have it, Skrillex and Diplo will be playing back-to-back at the Mad Decent Block Party. The first people to here this intriguing combination will be those that attend on September 15th in San Diego.