Starbucks is giving away a total of 20,000 complimentary pints of its own-brand ice cream from now until July 19 (that's around 800 an hour). The catch? You have to be on Facebook, and you have to nominate a "Friend" to receive the coupon (redeemable at local grocery stores).I've not tried the frozen treats yet, but the Caramel Macchiato sounds the best of the bunch (the others are Mocha Frappuccino, Java Chip Frappuccino and plain ol' Coffee). But if you're out of luck when you visit the Facebo
