Tumblr is not under any kind of threat.
Megaupload’s shut down was part of a TWO-YEAR FBI investigation, and was completely unrelated to SOPA and PIPA (which, BTW, are effectively dead after yesterday’s protest.)
And even then, Tumblr’s not a host for much pirated content.
Can people please stop freaking out? Or at least tag it so I can blacklist it?