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Since CiviCRM always integrates with a host CMS and those CMS all have SM tools available as add-ons, I think it's a good idea to focus on where CiviCRM can contribute something new / special to the mix rather than implement things already available through existing plugins / modules for CMS.
* CiviEvents can connect to Facebook Events, letting people RSVP on both CiviCRM as well as Facebook, this not only improves the social reach of the event, but also let the participants invite their social media friends to the event.* Collecting all the public Facebook posts, tweets about a particular event, and collect them and show them on a particular event. This can further be used to calculate reach of the event, which can then be visualized using Civisualize on the event page.* Letting people add badges to their profile picture (something like https://www.picbadges.com/)