I don't think Google will actually kill G+ off any time soon - that would be too embarrassing a retreat - but they've finally stopped shoving it down people's throats as hard as they were before. (Amusingly, I re-connected recently with an old friend from university who is now fairly senior in Google. Where did we connect? Facebook. Says it all, really...) The only place I've seen bits of "Circle" lately is on Twitter, plus a few I've added on Facebook. I took a look on Brewmasters when someone tried to nudge us that way, but didn't take to it; Multiply seemed fine until they pulled the plug, and we seem to have been largely homeless since.
I like Firefox, Opera, Chrome, Safari - all decent browsers in general. I share your misgivings about Opera's new owners, though, and I'm very glad Fastmail (my own email provider) is now independent again; having my email under Chinese control would be quite disturbing.