Everything is a Freaking DNS problem

One more thing about Social Networking today ..

Back at T-Dose I realized what one of the older social networks around is. It's the keysigning events that happen at different conferences. At least you have to see the people who's keys you sign and not randomly accept invitations from people you vaguely know (which is something I don't do)

So LinkedIn is repromoting it's groups feature. So what groups should I try to create ?
* A couple of Alumni groups for companies/holdings I worked for ?
* A couple of Conference groups ? (Fosdem/LinuxTag/UKUUG ?)
Or should I just wait till someone else does that for me ? I`m lazy right ? :)