<http://schema.org/about>
"While some may argue that social networking tools, like Twitter and Facebook, are a waste of time, and others consider them to be innocent fun, there are a few"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/green-tech/computers/photos/7-times-social-networking-saved-lives/more-than-just-fun>