To comply with new trade restrictions and economic laws Blizzard has been forced to restrict players in Iran from using its Battle.net service, which means the country can no longer access games such as World of Warcraft and Starcraft II.
“We can’t speak to reports surrounding the Iranian government restricting games from its citizens. What we do know is that United States trade restrictions and economic sanction laws prohibit Blizzard from doing business with residents of certain nations, including Iran. We’ve recently tightened up our procedures to ensure compliance with those laws, which means we must restrict access to our games by players in those nations,” reads an official statement from Blizzard.
If Blizzard thought that no one would really care about the ban then it was dead wrong, there’s currently a two part thread on the Battle.net official forums about it, which now spans over 130 pages.