How can a Social Netwok fit into your Universe

I have been keeping my eye for a while now (the last 2 year) on the increasing popularity of social networks. Most notably there business application and significance. The every increasing speed of life and the ever growing number of tasks we have to undertake compress the time that we have so much that it literally leaves no room to establish new contacts unless off course you make this a big priority which means you have to sacrifice something else. Off course you don't really have a choice you need to work your way through and create new business so that means you have to be smart about it and make this process as efficient as possible.

Let's say you have the chance and meet a new client how do you stay in touch to keep the contact alive. It has become very hard to stay in touch with business contacts and try to keep the spark or even grow that relationship into a more informal one. How about you meet 10 interesting people on a conference and you want to stay in touch with them purely professionally.
To be honest I have not yet created an account with any of the existing social networks but I have stumbled upon a very interesting article from one of the blogs I read about Facebook that could turn the tide for me.
article link

Now Scobelizer brigs up a very interesting point which pretty much sums up everything about Facebook, social networks and their application as a business tool.
He says Facebook is a multilevel marketing platform. He then goes one and one proving that point but if you stop and think about it for a second it really is quintessential. The only open questions is how many business people from the old generation are open enough to actually use such service and how much of them prefer everything to happened behind the scenes and prefer to not share who they know and who doesn't.