ThisNext - the social shopping community where users can discuss, discover, and recommend products - is giving away a $300 Shell gas card redeemable at over 14,000 domestic locations. To enter, simply recommend any product and tag your pick "TN Gas". No cap on entries. Details here. They also give away freebies to community "Mavens" which are members that stand out as key influencers. Those don't involve a contest; once you're accepted into the Maven community, you receive routine swag packs.