While the author of that article makes many valid points, none of them strike me as anything more than alarmist.
The government will get information about you whether or not you buy in to social networking.
You are being stereotyped and demographed everywhere you go.
For people like me, who just moved 900 miles from my hometown, and whose friends are all in different colleges, things like this are tools to help us keep in touch. A social networking site is not supposed to replace real interaction, for those of us who aren't "addicts", it's simply a tool to help us share photos, and keep in touch.
The point of my post was not to start a debate about social sites, it was to say: hey, we have a group on facebook, join if you've got a facebook. thanks.