On January 18, 2012 at 8:00 am until January 18, 2012 at 8:00 pm Lensroll Goes Dark to protest SOPA/PIPA and Internet Censorship.
SOPA, H.R. 3261 and PIPA (Senate Bill S. 968) are two versions of the same anti-piracy bill. Both are intended to curb online piracy. While SOPA has been shelved indefinitely due to political pressure the fight against PIPA continues.
Here are a few useful resources on the topic:
If PIPA passed it could possibly pave the way for blocking domains. Something China does daily.