How the web is changing certain social exchanges

I've just come across this phenomena lately, and it's obviously a result of social networking on the web.

It used to be that when a person was coming to town, she'd reach out and personally contact the people she wanted to see while here. That way we can make plans to see one another either one-on- one or in a small group. When I'm preparing for a trip, that's part of my preparation-- I reach out to the various people I want to see and email or phone them. Or, I have one well-connected, well-org