Hi, I am an international student, and I worked on campus and filled out the tax return using turbo tax.com. One of my friends said that as an international I shouldn't , but the thing is I sent them my social security number, and I always get $1000 as my refund!is this wrong?should I stop filling the tax return forms?If yes should I give back my return for 2010 and 2011?help me out here thanks

Your friend is right. What you got was the American Opportunity Credit, which is an education credit to which you are NOT entitled.

You need to amend your 2010 and 2011 returns and return the money.