As long as people I know and care about are using a social site, I’ll continue to use it. I have FaceBook and Google+, since there are folks I know who use one or the other. I also use Instagram, GeoClique and Share. The last two are communities borne of other social sites from when the iPhone first came out. Both of those closed, and now there are new sites run by members of those first communities, so I am friendly with the people running those sites. I started Instagram when those two were gone, and made new friends there, so now I stay there, too. It’s a bit overwhelming, so I’m not likely to start using any new social sites