I started to use a social networking service called Linkedin. It is based on the idea of six degrees of separation…that anyone that we want to meet is only 6 connected people away from us (and in the end, we all kiss Kevin Bacon the joke goes). I uploaded my 5,000 outlook contacts to the database and I was surprised that 1500 of them were already members of Linkedin. The challenge of these sites is to get the critical mass – clearly Linkedin has it!