Community sites like this exist because the current legal infrastructure (DMCA) allows us to host user-contributed material. Under provisions granted by SOPA/PIPA, if a copyright holder believes that any piece of our website violates their copyright, they could use unprecedented measures to deny everyone access to our website and services without due process. From Tom's Hardware: In a nutshell, here's what the law would do: Assign liability to site owners for everything users post, without consideration for whether or not the user posted without permission. Site owners could face jail time or heavy fines, and DNS blacklisting. It would require web services like YouTube, Facebook, and Twitter to monitor and aggressively filter everything all users upload. It would deny site owners due process of law, by initiating a DNS blacklisting based solely on a good faith assertion by an individual copyright or intellectual property owner. It would give the U.S. government the power to selectively censor the web using techniques similar to those used in China, Malaysia and Iran. The Great Firewall of China is an example of this type of embedded, infrastructural internet censorship. From Wikipedia: Websites that host user content Opponents have warned that SOPA would have a negative impact on online communities. Journalist Rebecca MacKinnon argued in an op-ed that making companies liable for users' actions could have a chilling effect on user-generated sites such as YouTube. "The intention is not the same as China's Great Firewall, a nationwide system of Web censorship, but the practical effect could be similar," she says. The Electronic Freedom Foundation (EFF) warned that websites Etsy, Flickr and Vimeo all seemed likely to shut down if the bill becomes law. Policy analysts for New America Foundation say this legislation would enable law enforcement to take down an entire domain due to something posted on a single blog, arguing, "an entire largely innocent online community could be punished for the actions of a tiny minority." Growing Chorus of Opposition to "Stop Online Piracy Act" | Center for Democracy & Technology EFF for a more thorough explanation.