Free Speech vs Social Acceptance

Interesting piece on censorship in social networks. http://www.webpronews.com/should-social-media-censor-offensive-content-2011-08 While inconclusive as to whether or not censorship happened in this instance it does raise an interesting question with respect to free speech while maintaining a socially acceptable existence. I had read earlier in the week that Google’s “What Do You Love?” search experiment (http://www.wdyl.com/) is also removing offensive keyword searches and preventing people from searching on lewd terms. Is cleaning up the web infringing upon the 1st Amendment in the US and similarly held beliefs in other zones?