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They're testing the waters will little known sites. (I have never heard of the sites mentioned in the linked article.)

My prediction: if there are no serious challenges to this, then the pace will pick up and they'll start going after higher profile sites, like TPB.

I think TPB got temporarily shut down in Europe.

Simply because ThePirateBay uses a domain register that is not located in US.

Most confiscated domains have registered with GoDaddy.