Facebook operates:
Facebook Beacon, Facebook Connect, Facebook Conversion Tracking, Facebook Social Graph, Facebook Social Plugins
Facebook is an online social network accessible to anyone with an active email address. People use Facebook to keep up with friends, upload photos, share links and videos, and learn more about the people they meet.
AddThis - Facebook - Google Analytics - Google Custom Search - Histats - Omnituire - Scorecard - Sitemeter - Specific Media - Turn