As Facebook has reached 500 million users, corporations have struggled with drafting policies that properly limit misuse of social media by employees. While a company’s approach to social media will vary depending upon the corporate culture and industry, a look at the social media policies in the Fortune 500 companies’ codes of conduct highlights how corporations are addressing the Facebook phenomenon.

First, social media policies are new. Most companies have yet to integrate a social media policy into their codes of conduct. Indeed, virtually all of the codes of conduct that addressed social media and/or social networking policies were revised in 2009 and 2010.