MI and the Spooks have been dropping shit on Twitter for years, anon to communicate with each other. Do you know all those music videos on Youtube with well known songs with shitty videos encoded with them of beaches and shit. A lot of have messages in them. They drop them in certain channels at strategic points and use stego as well.
Lots of action going on though and it's hard to keep track of it all so they set up a central hub of nonsense that could easily be dismissed as crazy town. It's not the only reason for this board but it's one of them.