I highly doubt they can get near the top 10. They'd first have to battle their way past the heavy weight technology companies, then the banking giants, then Wal-Mart and finally the the ridiculously lucrative oil companies (source: http://money.cnn.com/magazines/fortune/global500/2010/perfor...).

They have to figure out how to monetize a lot more $ per user to be very profitable in the long term.