Sounds like they have developed tech similar to Katango - http://www.building43.com/videos/2011/07/12/katango-organizing-your-social-network/ http://www.buildin

Sounds like they have developed tech similar to Katango - http://www.building43.com/videos/2011/07/12/katango-organizing-your-social-network/ http://www.building43.com/videos/2011/07/12/katango-organizi... And now Google probably also knows that much about you because they bought Katango. LinkedIn also bought Rapportive recently, so they have a very high quality people database.