Damn! This (Lil) Green Patch thing has nearly 5.5 million monthly active users. (Making it among the very most popular Facebook apps.) What’s more, all those virtual plants have raised nearly $55,000 for the Nature Conservancy’s Adopt An Acre program.

Created by David King and Ashish Dixit, (Lil) Green Patch cleverly leverages roleplaying game mechanics for ecological good.

Facebook’s Virtual Plants For Real Forests « Earth2Tech

A standard reality game.