I wonder what he thought made Google+ "less mindless" than the other platforms.
On mailing-lists, worst case there is "that guy", and you can filter them out. Maybe you'll meet at a conf eventually and work things out in person. On Twitter/Facebook, you have to spend a lot of time blocking people and trolls have full control of the platform.
EDIT: from his interview: 'I tried G+ for a while, because the people on it weren't the mindless usual stuff, but it obviously never went anywhere'
As an example, check out the myriad articles about Google users being outed as trans when Google started integrating Google+ into everything: https://www.theguardian.com/technology/2014/jan/07/google-ha...