If I want to post publicly to my "followers" (people I don't know) I use Twitter, if I want to post to my friends I use Facebook, for me and almost everyone else I've spoken to Google+ offers no value. I still don't understand what Google was thinking with +, it offers nothing to most people. The only good feature is hangouts which could easily be a separate product. I have around 150 friends on Facebook and I see a…
How about publicly post long form content to your followers? Because G+ excels in that, and both Facebook and Twitter fail at it. There's a network effect problem, for sure, but it does have a purpose in the situation you outline.