The post below is part of a fad that's been sweeping comics websites--Marvel's doing a big crossover called 'Civil War', in which their superheroes are divided over a controversial law that makes them register their activities with the government. Iron Man believes that it's important to regain the public trust, while Captain America calls it a violation of civil liberties. And Marvel decided to release little "banner" images you could put on your own website, one with a picture of Captain America that says, "I'm with Cap", one with Iron Man that says "I'm with Iron Man".
Then some guys modified the image to be a shot of Ms. Marvel...from behind...from about waist height...and changed the slogan to "I'm Following Ms. Marvel". It kinda ballooned from there.
The image below is part of my tiny contribution to the fad. I'd post the other two, but several people who read this still haven't seen Season Two, and I don't want to spoil a big plot twist.
So now you understand not just the context, but my allegiance. Because really, whichever side Doctor Who takes is the side that's going to win anyway.