Neighbors are an important role in the playing of the game My Tribe. Visiting neighbors, you can find one feather per island each day, and can also "sit" on their island, collecting crates, moondust, startdust, etc. To add people as neighbors, you must first add them as a friend on Facebook. After you have added them and they accept, they will automatically show up in the neighbor's list at the bottom of the screen in game play.
There are many places for which you can find people to add as neighbors. The best way to do so is to go to the discussions page on the My Tribe application page (not the game itself) and there are may "add me" posts there. The main "add me" post can be found here .