Do you have an adjusted TOS agreement yet? Be careful about signing up for new social media products without checking on that first. GSA is in the process of getting a governmentwide TOS signed so we can add this to the apps.gov directory.
That said, I’m really looking forward to using it in the not-to-distant future. As I see it, the primary group of users are currently social media workers (writers, strategists, etc.) and tech types who have a lot of reach across their circles so try to tailor your content towards them and you should see more results.
I also think the potential of Hangouts could be useful.