I have created a couple of custom reports and a social media dashboard, they're all written up here: http://www.koozai.co...mx-london-2012/
If you're new to the social reports in Google Analytics the slides in that post should help you find your way around.
The reports and dashboard are:
- Social Interactions by Day of the Week: http://kooz.ai/socialbyday
- Social Visitor Loyalty: http://kooz.ai/socialloyal
- Social Media Dashboard: http://kooz.ai/socialdash