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Everyone loves Facebook for social networking. But how many of you use it to do good?

One way you can enhance your Facebook experience is to add the Tree Planter application from the Arbor Day Foundation. Developed in conjunction with Toyota, the Tree Planter app aims to plant 1 million trees through your participation.

Here's how it works: You add the Tree Planter application to your Facebook profile. For one dollar, you can then send a virtual gift to any of your friends. That one dollar plants a real tree.You can choose from ten different tree species, which will be planted in 11 American forests affected by recent forest fires.

Toyota has pledged the first $50,000 to support the program, which means that the first 50,000 virtual gifts are actually free. Every user gets to give one free tree to a friend until that 50k is used up. After that, it's up to us.

If you're not on Facebook, you can always join (it's free, and fun), or you can just visit the Arbor Day Foundation online to buy a tree on your own.