Crossposted from the OpenNet Initiative

Last week, as Iranian voters went to the polls to elect the country’s next president, the Iranian government blocked access to number of political Web sites, as well as Facebook, YouTube and Twitter.

Yesterday the OpenNet Initiative profiled the extent of this crackdown. Today we are releasing a new survey of Internet filtering and online content controls in Iran, which details the most recent instances of censorship and provides a basic framework for understanding the legal, technical and institutional mechanisms of filtering in Iran.