Hi Clay, we now have sharing buttons! Users can click to share any topic to Facebook, Twitter, Google + and LinkedIn. If you already have a community up and running, you will need to turn on the feature. To do so, go into Settings -> Community -> Content and check the option enable social sharing buttons. For anyone starting a new community, this feature is enabled by default, so you don't have to do anything.
Note that this feature is disabled in private communities for obvious reasons!