Met plenty of people in person from t3h instardnet.
Mostly car stuff - meets, track events, shows, etc.
First experience I was slightly nervous about - dont even give it a second thought anymore.
If you think about it, its no different than meeting anyone else in any given situation - only youre already aware of the fact that youre all there for the same purpose - be it aviation, racing or sex with minors.
Its kinda cool actually - you could spend a year straight in a bar in your local town and never find anyone who could correctly ID and tell the difference between a 109G6 and a 109F4 based on a shadow - but I would imagine that at a place like the AH con, which Ive never been to, its got to be a hoot listening to all you grumpy old men rattle off about niki dweebs and the advantages of radial engines.