Congrats - you've checked in at 5 different Starbucks! Be sure to pick up a double tall latte for your friend - I'm sure they'd do the same for you.
Checkin at a 5 different location tagged with starbucks.
Tip: Do a search on Foursquare for "starbucks". Visit five of these locations in order to get the badge.
Unconfirmed: You only get credit for checking into places after this badge was launched on 3/11/2010.