I do miss Google+. For my brain / use case, it was by far the best social network out there, and the Circle friends and interest management system is still unparalleled :)

Google+ was fun. Failed in the market though.

Apple made a social network called Ping. Disaster. MobileMe was silly.

Microsoft made Zune and the Kin 1 and Kin 2 devices and Windows phone and all sorts of other disasters.

These things happen.

I have a hypothesis that Google+ just wasn't addictive. Which is a good thing now, but not back then

Windows Phone was actually good. I would even say that my Lumia something was one of best experiences ever on mobile. G+ was also good. Efficient markets mean that you can "extract" rent, via selling data or attention etc. not realy what is good