Does anyone have a social media risk assessment they are willing to share?

Sure - risk extremely high. Mitigation factor - don't do it

Here is an article that might be of some interest:

http://www.ababj.com/briefing/7-steps-to-effective-social-media-risk-management-2301.html

There are other resources out there. just Google "social media risk assessment bank"

Who is typically responsible for completing the social media risk assessment? Marketing?

Just curious...........

Not on your life. What does marketing know about risk assessment processes. You usually don't let the fox guard the chickens.

I perform product risk assessments and work in Operational Risk Management. However, I consult with experts from all relevant business units to obtain their concerns and feedback to ensure it is a balanced assessment.

I found alot of good guidance online through a google search.