How can I insert a html link like the 2 posts below with the Facebook iOS SDK?

Link to Image!

In Train Conductor and "itunes.apple.com" for The Fleas post they use a bit.ly link.

I tried to use the html tag <a href="www.mystuff.com">Whatever<\a> but it didn't work.

NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                               @"My game in iTunes", @"name",
                               @"http://www.mystuff.com", @"link",
                               @"Check out this cool game for iPhone.", @"description",
                               nil];

This code works but that is just a normal post.