Add a logo and link to civicrm.stackexchange.com
While civicrm.stackexchange.com is perhaps not strictly, or only, a social media site, it is a valuable resource and a place where people engage in useful discussion, so social in that way. So it is worth adding a StackExchange logo to our other social media logos, with a link to civicrm.stackexchange.com, and having the logos at both the top of our home page as well as all the way at the bottom.