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Date For Trees has partnered with American Forests to donate trees for every sign up with the goal of donating at least 12,000 trees annually. But it gets better -- up to 250 unique Mashable readers can sign up to get a free account, and one dollar (or one tree) will be donated to the forests. The sign up entitles you to a full premium one-year membership valued at $14.95. Premium membership entitles you to participate in the blog, be included in search results, send up to 100 messages per day, store 200 messages in your account for up to 140 days, save profiles you like, and customize your user preferences, among other very cool features.