More than 10,000 sites joined the protest against the proposed anti-piracy laws in the US. Google's petition against SOPA and PIPA saw over 4.5 million signatories. Facebook, AOL, Wikipedia, Amazon, Twitter, and Firefox were among the prominent protesters.

Check out the slideshow on top 10 protesting sites:

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Wikipedia has been instrumental in upstaging a massive online revolt against the SOPA/PIPA amendments. The news of its impending website blackout spread like wildfire and in the process joined several parties promoting the campaign.
Being the most sought after resource for free and open source content, Wikipedia takes the prime spot in the list. It takes the credit for its striking words: "Imagine a World Without Free Knowledge."

Though, a bit late in entering the fray of anti-SOPA campaigners, Google has smartly conveyed the message on its home page with the citation “Tell Congress: Please don't censor the web!” Being the top search engine site globally, it sweeps the second position right under the feet of Reddit.

Reddit takes the third position in the list, solely because of its bold initiative to join hands with Wikipedia and demonstrating its support for the noble cause. It is one of the world’s top blogging sites and takes the credit for the bold message on the home page: “Stopped they must be; on this all depends.”

Mozilla has long been the savior of open free access to the web. Undoubtedly, it is the leading web browser striking a good balance between security, performance and plug-in compatibility. One glance at their heart-touching statement: “And we’re dedicated to keeping it free, open and accessible to all,” will convey the message to the critics of open source content.

WordPress has officially joined the protest against Senate Bill 968: the Protect IP Act according to the press release posted by Jane Wells, filed under the community section. The site has boldly sported a banner: “STOP CENSORSHIP” in the right hand top corner of the page.

Amidst all the chaos and confusion, SOPA Strike – an independent web-service provider, has demonstrated its guts to upstage anti-SOPA protests by introducing a platform to consolidate the list of protesters on their site.
Their gallant message to the public: “WEB GOES ON STRIKE” is a sure inspiration. Besides their own campaign message: “January 18th, 2012 is the largest online protest in history, to stop the internet censorship bills, SOPA & PIPA. Join in by blacking out your site and urging everyone you can reach to contact Congress now.”

Tucows clearly mentions the reasons behind its protest against SOPA and PIPA on its news page. It hints that the passing of these bills could damage open sharing on the internet and also hindering freedom of speech. Citing Reddit as their friends, Tucows have disclosed their intent of joining the blackout party organized by the former.

XDA being a completely open source developer community finds every reason to oppose the restrictions imposed by SOPA and PIPA amendments. The sole reason of success for this dynamic resource has been its ability to freely exchange information, ideas, and development.
But, SOPA and PIPA might put an end to all that by imposing bans on the grounds of copyright infringements. The banner on their website dictates their hapless state: “WEBSITE BLOCKED – The site has been blocked to the Americans by the U.S. government firewall." Their humble request to the public: “XDA to Go Dark on Jan 18th at 8AM; You Can Help Bring Us Back Online.”

Icanhascheezburger is also into the fray, announcing its intentions of blacking out its website on January 18. One Twitter message by @benhuh states:” All Cheezburger sites will also be instituting a blackout on January 18 to protest SOPA and PIPA. Now, go ask Wikipedia to do it.”

Minecraft – one of the most popular online game site, has announced its participation in the blackout campaign as a part of the Internet-wide protest against SOPA and PIPA. The site’ home page quotes a rather funny message: “PIPA & SOPA? HOW ABOUT NOPA!”