The links on the top bar of an individual article page are in the form of http://tcfast.com/?backTo=/2011/07/14/larry-page-earnings-ca...

But "backTo" parameter also accepts full URLs, so something like http://tcfast.com/?backTo=http://cnn.com/&t=g will happily redirect to CNN.

This might not be desirable for you, because in effect it will transform your site to a free redirect service ready for use by spammers.

You should check the value of "backTo" parameter and redirect only inside your own site.