From their Facebook post:

Bentley's Popcorn, Inc.
https://www.facebook.com/BentleysPopcorn?sk=app_121121694568521

To our friends- we are giving away FREE popcorn! Sign up and spread the word to get your free bag now!
Bentley's Popcorn, Inc. | Sweepstakes
Together, we can make a difference! When you buy Bentley’s Popcorn products, we automatically make a charitable donation to the Homeless Pets Foundation, an all-volunteer group that gives Bentley’s Buddies a second chance through rescue, medical care and adoption. Visit http://bentleyspopcorn.com/BentleysBuddies.html


First 100 who register.