We liked this current Facebook promotion by Oakley Europe.  Very simple, but very effective.   All you have to do is to show that you’ve checked-in on Facebook when you make a purchase and you get a free T-shirt.

Okay, there have been a few negative comments about the fact the offer is only available at the Covent Garden Store, but other retailers are stepping in to get involved.  Overall, nice creative use of Facebook.

Oakley_facebook

A great promotion (if you live in London...)