A lot of genealogists have been joining Facebook. However, an article by Brian Stelter published in the New York Times questions the recent changes in Facebook's terms of service. Those terms of service used to give users the authority to remove content they created at any time. The new terms of service state that Facebook owns everything the users create and post to the service. Further, it added new language that now says Facebook can retain users’ content and licenses after an account is terminated. No matter what you say or do, Facebook owns your content.
In short, the new terms of service mean that “anything you upload to Facebook can be used by Facebook in any way they deem fit, forever, no matter what you do later.” Brian Stelter claims that many Facebook users are up in arms about the new language.
You can read more at the New York Times' web site at http://www.nytimes.com/2009/02/17/technology/internet/17facebook.html?_r=1&emc=eta1.