Building community is about more than just interacting with a few, like-minded people. Real communities span age groups, and have diversity as well as areas of commonality that enable connections. Shared meditation can be used to provide some common ground and bring otherwise disparate people together.
Coming together to share a specific interest creates a good foundation for a community. Performing a communal activity can build bridges because issues of wealth, class, race and also religion become secondary to the work in hand. So much of our life does not encourage us to mingle with people outside our normal sphere and so our communities readily reflect too much of what we already know and think rather than opening new doors.
