I set up a nextdoor.com account for Potomac Yard, and hope people will join up.
The goal of the site is to provide a social networking site that is private for those in the neighborhood. It is supposed to be a great way to avoid mailing lists, but still be able to get to know neighbors and keep up to date on stuff going on in the neighborhood.
They were supposed to send out a bunch of post cards inviting people, but I don't think that ever happened. I added a bunch of the addresses between McKenzie and East Custis, you should be able to add your own, or let me know and I'll see if I can get them to add your address.