When I see a shortened URL, I'm always hesitant to click it because I don't know where the link is going to go. (In the worst case, it may lead to an XSS exploit against a site that I'm logged in to)
How can I tell where the link is going to go?
For example, if I see a link to
http://tinyurl.com/3yjnm7y I can go to
http://preview.tinyurl.com/3yjnm7y and see where the link is going to send me.
How can I do the same for other popular URL shortening services (like bit.ly or goo.gl)?