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XDA-Developers, is a site of over 4 million users, allows others to hack and discuss Windows Phone, Android, and webOS phones. It is a fantastic online community where software is modified and edited to simply make it better.
"Along with Reddit and many other sites, we have decided to go dark (beginning at 8AM ET) for a period of time today in protest of pending Internet-related legislation in the US. Our goal is not to raise awareness of this legislation. We assume most of you know all about it. Our goal is encourage users like you to get involved", the static page read.
It also said that once 50,000 U.S. visitors have signed their pledge on the page, the site will return.
You can read XDA-Developer's comments here.