Untethered communities,or letting virtual strangers stay at your house

Lee Fefevre lets a stranger stay in his house; Ross Mayfield writes about untethered communities–both are examples of what Jon Lebowsky describes as ” communities are no longer tethered to specific technologies or virtual places. They find many ways to connect, and they keep searching for more.”
For a slice of the world, loose ties become stronger with the aid of social media tools…
Is this happening for you?
If yes, how so?
If no, why not?