ON THIS LINK

Show support for the people who fight for democracy at Iran, and change your Twitter avatar to have green overlay or green riboon (green is the official color of the movement).

All you need to do is click here to add green overlay or to click here to add a green ribbon and your avatar will be updated and a support Tweet will posted on your behalf ("Show support for #iranelection add green overlay to your Twitter avatar with 1-click - http://helpiranelection.com/").