As someone who likes to avoid posting too much incriminating information on social network, I think the main problem of this trend is that the Internet is turning into No Country for Lurkers.
I can't even favourite nor like a video on YouTube anymore without being subjected to the whole carrousel of signing up for G+. I get the impression that there's some asshole at companies like Google creating a Markov chain for bumping head-first into a registration wall for the most inane lurker actions.
And this is not to mention the absolutely awful situation of being locked out of my own list of favourites, because I am now required to sign up for G+ to export them.
Don't you love the Silicon Valley CEOs who say they want to index the world's information and allow everyone to share it - except this is becoming increasingly impossible on their own platforms such as Facebook, Google, and Quora.
I get that companies have to make money, but I think the companies' business models are perfectly aligned with their personal philosophies.