It was only megaupload, and that was shut down illegally by Team America Wold Police. Fortunately this tactic doesn't work in countries that don't bow down to the whims of the American government, like Sweden.
You misunderstood who I was referring to! Not the filesharing sites, but the often illegal sites the file sharers get their stuff from - child porn sites etc - that are opened one day, closed the next, and their stuff is only available from other file sharers after the 'sites they love' are closed by the authorities.
Sorry for any confusion!