On June 12, Mahmoud Ahmadinejad was reelected as president of Iran, sparking violent protests in Tehran and prompting Twitter users to turn their user icons green in support of this man, his main rival.

Mahmoud Ahmadinejad was declared the winner of the June 12, 2009 Iranian presidential election, which sparked massive protests known as the Green Movement. Mir Hossein Mousavi was Ahmadinejad's main rival and the leader of the opposition; his supporters used green as their color and changed their Twitter icons to green to show solidarity with the movement. The other options are not relevant - Asif Ali Zardari is Pakistani, Mohammad Ali Abtahi is an Iranian cleric but was not the main rival, and Ayatollah Khomeini was the Supreme Leader, not a presidential candidate.