Social networks are great to try out when you have friends on them. I think I downloaded Path 5 times and each time I didn’t have a single friend on them (clearly i’m getting old). Same thing happened with Peach. I downloaded it and knew no one. So I uninstalled it. I can’t even be bothered at this point (even for research and knowledge) to invest time in seeing what another social network is doing when I know no one on the network.
Facebook’s closed off launch was the key. All of these guys forget that. If on the other hand I had to get an invite to join Peach (like i did for Beme) then i would have most definitely tried it. The invite would have made me feel special enough to invest time in the app and the person who invited me.