The revolution is lead by people who are just as anti-American as the government.
Wrong! Try again.
They are only asking for help from Western countries over the internet and risking their lives doing so. Many supported Mousavi, because one of his platforms was improved relations with the West.
If you believe that Mousavi is pro-American, you're wrong. If you believe that the young urban elite that are using the internet are pro-American, you're wrong. If you believe that the majority of the Mousavi supporters are pro-American, you're blind.
Anti-Americanism in Iran runs through every sector of society, and goes deep. Yes, there are some people (less than the western media seems to be amazed by, but still certainly some) who are using technology to spread news from within Iran to the world and to share information internally, but these people are still, broadly, supportive of the Islamic revolution and islamic clerics - and strongly dislike American global power projection.
Then why were the protest signs written in English?