I've created a Travel Mapping Project group on LinkedIn to help project contributors and users to connect up over there. Like the Twitter account we've already had for quite a while (
https://twitter.com/TravelMapping), my main motivation is to create another way that the project can get a little exposure beyond those already connected by things like the AARoads forum.
I believe you can access the group page on LinkedIn at
https://www.linkedin.com/groups/12581738/ .