Rand Fishkin asked on Twitter if anyone knew what social networks are included in GA's social reports. So I pulled together a list from our biggest clients, which included 248 sites (who knew?). You can see the list here. But if you want to see what social networks are driving traffic and conversions to your site, you can use this custom report.
Here's a screenshot of what it looks like:
Edited by AnnieCushing, 15 November 2012 - 10:46 AM.