Free t-shirt from Climberism for referring friends!

Preview

Here's a free t-shirt you can score. Sign up for Climberism's free email newsletter here. (Climberism is a climbing magazine.) After you sign up (it's free!), invite your friends. Once you get 5 friends to sign up, you can claim your free t-shirt. You'll have to have your friends verify their subscription via the link they'll receive through email. You can also log in and track your referrals once you've signed up.

UPDATE: They've now changed it to say 500 friends, which I think is pretty ridiculous. I don't know if they messed up or they weren't prepared for the response they got, but either way it seems a little lame. I'll let you know if it changes back to 5.