Some examples:

• http://www.esecurityplanet.com/views/article.php/3877481/How-To-Set-Social-Networking-Policies-for-Employees.htm (great introduction)
• http://www.compliancebuilding.com/about/publications/social-media-policies/ (list of 100+ policies)
• Red Cross International (great policy)

Concerns:

• How to get management buy-in / involved
• Should we publish photos from our employees?