Free Starbucks Frappuccino (coupon for Bottle) for a Facebook Friend
Seems like a lot of work. But you nominate a Facebook friend for a Starbucks Frappuccino Coupon (single serve bottle) with a brief story about why they deserve one. Someone else apparently has to "approve" the nomination by clicking on it. Here's the link:

Frappuccino "You Deserve One"

They gave away a free pint of ice cream before on facebook