Google has censored the logo to protest against SOPA. This was visible only to US visitors

Google has also joind the anti-SOPA force but it did not black out any of its website. It has joined the protest by putting a censored logo which is only visible in US verison of Google.
Google’s David Drummond, SVP Corporate Development and Chief Legal Officer, posted about SOPA on official blog. He wrote,”These bills would grant new powers to law enforcement to filter the Internet and block access to tools to get around those filters. We know from experience that these powers are on the wish list of oppressive regimes throughout the world. SOPA and PIPA also eliminate due process.”
“hese bills would make it easier to sue law-abiding U.S. companies. Law-abiding payment processors and Internet advertising services can be subject to these private rights of action. SOPA and PIPA would also create harmful (and uncertain) technology mandates on U.S. Internet companies, as federal judges second-guess technological measures used by these companies to stop bad actors, and potentially impose inconsistent injunctions on them,” he added.
Most of the internet companies and websites are against this ACT. Wikipedia and many other websites have blackout against this act.