There are some really interesting YouTube videos too, about relationships.
Sometimes I wonder about those people who seem to vanish like that, I think on some of those sites they enjoy meeting as many people as possible in a short time, which tells me they aren't in it for a relationship just the fun of it.
Not my idea of fun though.
When I meet someone I want to really get to know them, it's too confusing trying to learn about more than one person at a time for me.