Just spotted this:
It says 'promoted by Chris Moyles' - which means that Chris has paid (and these things aren't cheap, we're talking £2-5k minimum) to have a seemingly meaningless tweet promoted.
The only reason I can think of is to keep his profile up, but by doing this he would need to have an upcoming reason to raise awareness. Confusing though as the Kaiser chiefs don't have a particularly large following on Twitter (55k on the official account, similar with band members).
Having said that, he could have just thought it was funny to promote pictures of Rick looking ugly on his birthday.
Very hard to think it's not a pilot for something in the future - anyway, it only got 173 RT's so can't have been a successful experiment!