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)

NRENs

• JISC's policy (great starting point for others)
• SURFnet's policy (in Dutch)
• TERENA social media guidelines.These were creating by Laura/Carrie/Gyongyi  but were not accepted nor rejected by Management Team since 'social media' is not formally considered a focus area. So, for now, they just collect dust. I share these with you because we (PR) stand behind them and see it as a good start and we hope it inspires others!
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Concerns:

• How to get management buy-in / involved
• Should we publish photos from our employees?
• Censoring tweets, etc - yes or no?