I run a pretty popular blog on my other account that would be greatly affected if SOPA and PIPA were to pass. Because of this, I am blacking out my Tumblr for the rest of today. I urge everyone to go to http://sopastrike.com/ and sign the petition as well. 

To black out your site, go to “Settings,” and check the box next to “Black out this blog for the rest of the day.”