Social media is always a concern that is very poorly understood and executed by Organizations. The integration of social media with their marketing strategies by businesses and other organizations is going to continue to raise new privacy concerns. For instance, hospitals and physicians and other groups are promoting the use of social networking sites by physicians to help their patients. One of the companies who sell hospital systems had an authentication system linked to Facebook to provide access to the patient care system. This could be a disaster to manage if any of the users are not able to manage their personal privacy settings which are always a user purgative for a social networking site.
Most social networks have good search capabilities which people use to find their friends or activities, information they might be interested in. This is a double edged sword. It is pertinent to be aware of privacy settings, especially when messages travel between different social networks (you might relay your Foursquare location to your public account), complicating the privacy parameters. Feeds you trust to share with friends and acquaintances have the power to profile you.
In 2007 when Facebook launched the Beacon program, user rental records were released on the public for friends to see. A lot of data collected by Yahoo! and MSN (Microsoft), have been posted online for trend and behavior analysis of its users too.