fixie - fixed gear bike sprocket and chain

I was looking for a fixed bicycle sprocket photo to represent a conference I am running called Traction. I have looked at hundreds of photos and yours stands out the most. I need a symbol that will represent this conference on facebook. The symbol needs to be no more than an inch square so that it will fit on I phones. What would it cost me to use it for advertising this conference? Email: bruceloganaia [email removed - click "write a comment" to view email]