Earlier quoted context omitted.
I hear you but Facebook, for better or worse, is the social networking site everyone you know is on. It has a tremendous advantage over any upstart for that reason. Lots of geeky folks flocked to Google+ in its early days but that wasn't enough to replace Facebook. Even when they gave everyone who had a Google account of some kind a G+ profile it still wasn't enough. I will definitely check this out but it'll be back…
Google+ always had a weird broken interface and they just never finished it. I was one of the geeks that flocked to it, and had plenty of friends there. It didn't fail because of network effects, it failed because they stopped working on it before it was finished. It was really strange and I always assumed at the time that Facebook and Google had come to some agreement behind the scenes.
I get ditching things that don't work, but G+ is a great example of something that had plenty of traction in it's early days and, as far as I can see, lost it purely because G didn't seem to care about it.