The election results of the Iranian election from yesterday are causing major concerns among voters and controversy. Also have a look at this article (in German): http://www.zeit.de/online/2009/25/iran-wahl-ergebnis. It is interesting that there is a lot of discussion on Facebook about this topic.
Below are some screenshots of polical messages I saw on Facebook today:
It seems Facebook is blocked in China, Persia & Co. for a reason. I wish the Iraniens good luck and hope Facebook somewhat helps them.