So on the GovLoop team, we use social media for our projects in a couple ways
We actually use a private group on GovLoop to talk to the GovLoop team. So for example when working on our Next Generation Summit or new android app, we’ll often talk about it at our weekly meeting but also have a discussion thread open before/after to share other ideas (not everyone wants to talk at a meeting)
I think communications is the biggest issue with most projects so social media is a great way to put out even more information and get quick feedback.
I also ping people on Twitter & GovLoop when looking for people to quickly look at a demo project (like an alpha project)