One of the recurring themes for us at iCrossing and our clients over the past year or so has been the way that the social web is should be thought of as a business issue first and marketing issue second.
An article about libel on The Lawyer website called

[caption id=attachment_5244 align=alignnone width=357 caption=Image: If social media is re-writing the law, what does it mean for business? ((cc) Eflon)
http://connect.icrossing.co.uk