Within a day of Facebook announcing their new Deals platform, Starbucks started advertising for their check-in rewards.
Retailer H&M is now doing the same: rewarding checked-in users with 20% their purchase. H&M has been an aggressive experimental marketer. For instance, they were early to advertise in Booyah's location game MyTown and have advertised on Facebook in the past. It will be interesting to see if H&M starts appearing in your newsfeed during the promotion (which ends today).