Recently there is something like a new hype (see e.g. here, here, or here) around some kind of new social networking systems like LinkedIn.com. To contact any user, you first must seek an introduction from someone else in that person's network. Introduction requests can travel through several degrees, with each person taking a bit of responsibility for the ultimate online meeting. Trying LinkedIn.com and quoting Robert Ambrogi I am inclined to say: "I was pleasantly surprised to find quite a few people I knew were already members. I'm not sure where this will lead, but it is fun to play with." (Member of LinkedIn? Knowing me? You can always send me a connection request at horns@ipjur.com.)