No it hasn't begun.
it has begun: http://uk.news.yahoo...-195854378.html
This has nothing to do with SOPA/PIPA. The Megaupload shutdown has nothing to do with it. Existing laws are being used to shutdown and prosecute the sites owners.
As much as I detest SOPA/PIPA, I recognise that electronic copyright violations is a problem. Protesting SOPA/PIPA is one thing, but the protest should not also be based on shielding the sites that facilitate the mass copyright violations that are occurring. As much as Megaupload had legitimate uses, it's business model was dependant on piracy.
Some sites should be shutdown. Megaupload will have due process.
I think that we can all agree that copyright laws are very important, some people just like to take things to far however.