You can play Megapolis together with your Facebook friends! Simply send them an invitation to become your neighbor, and wait for them to accept it.

To add someone with whom you are not friends on Facebook, use the Find neighbors button at the bottom of the screen. You will be given a chance to select from a list of randomly chosen players. If you do not like any of the suggested players, come back to this section again in a few hours and the list will be updated. You can also update the list of suggested friends right away by using Megabucks.
Finally, you can always find players in need of neighbors in the Megapolis community:
Make friends with new allies on Facebook, send them invitations, and play together. The more neighbors you have, the easier and more fun developing your Megapolis will be!