Wrong. What we're dealing with is a serious market-failure in a truly good system to keep in touch with the guy you just met at the meetup who you truly want to

Wrong. What we're dealing with is a serious market-failure in a truly good system to keep in touch with the guy you just met at the meetup who you truly want to connect with. He just goes and uses Facebook, and you use nothing. Neither is good. And that's the problem, not the rudeness issue.