Yes to all.

Had a Flyertalker stay at my house, actually, one year she spent christmas with us, two years later she came a few days after it, and spent new years at another FTers place... downside: we chitchatted all night like girls at summer camp and ate way too much good food

I also had the pleasure at staying at a FTers house and it was great again. Downside: we chatted until way too late and ate way too much good food.

And I crashed on the extra bed in a FTers hotel room after a DO one night.
There are times where Flyertalk feels more like a big extended family than a message board.