A couple of years ago I was excited to read that the folks who administer vatican.va were working on a social networking site, a kind of Myspace or Facebook for Catholics. I've been looking for it ever since, but it hasn't appeared.
Nevertheless, yesterday I discovered that such a site has been launched for World Youth Day 2008. Presumably it will remain after the event as a place to meet and network.
Check out XT3 and sign up!