Long story short, x-factor (pseudo talent show created to generate lots of high rate phone calls and texts with a fast-selling, short life "artist" or two at the end) has been christmas number one for about 5 years now. Presumably due to general musical apathy of the british public and buying mostly whats shoved in their face on TV.
Some guy on face book interprets this as being because simon cowell, smug tw@t behind x-factor, makes people buy the x factor single with a gun to their head or irresistible marketing campaigns leaving people helpless. Says that x-factor has always been xmas number one and tries to rebel against the trend by encouraging people to buy rage Killing in the Name instead, due to the "$% you I wont do what you tell me" section.
It does get to number one, because we're not all sheeple with no ability to decide what to buy based on our own tastes rather than television exposure, but enough of us are still suggestible enough to do what a guy on facebook tells us to.
13 year old girls across the coutry have their world turned upside down, the sky falls on their heads, the oceans boil and earth splits in two and they cry into their mince pies. The rest of us are quite amused by the whole thing.