Here in Cambodia the occasional black-out is not unprecedented.

Why sites are disappearing today:

SOPA and PIPA:
Infographic: http://americancensorship.org
Wikipedia Info Page: http://en.wikipedia.org/wiki/Wikipedia:SOPA_initiative/Learn_more
http://www.tehelka.com/story_main51.asp?filename=Op171211proscons.asp (@Sunil_Abraham)
http://www.pcworld.com/article/248298/sopa_and_pipa_just_the_facts.html
http://www.bbc.co.uk/news/technology-16596577
http://www.google.com/landing/takeaction/sopa-pipa/
http://digg.com/newsbar/topnews/sopa_and_pipa_learn_more_wikipedia_the_free_encyclopedia
http://www.informationdiet.com/blog/read/better-activism-day-january-18

Remember, SOPA's not dead, just being reformatted. http://www.forbes.com/sites/insertcoin/2012/01/16/so-is-sopa-dead-not-exactly/

Contact a Senator http://grassroutes.us/sopa

Developments on Twitter: http://twitter.com/#!/search?q=%23SOPA

Want to tweet but show your dissent? 'StrikeThrough' your tweets! http://adamvarga.com/strike/