"Google, the finest place where startups and products go to die" ;-)
God, G+ was bad though.
The "Circles" feature was a nice way to address that in theory, but the execution was really half-baked and the network effect didn't help them.
Mastadon seems interresting, but frankly I'd rather go back to IRC, and see some useful extensions to /whois details for better interconnectivity and profiles, but not so closed and walled garden as slack. Aside, I do still use irc for programming and bbs related stuff.
I miss IRC.