Every year, there are info graphics that come out showing what happens in an Internet minute, i.e. number of tweets world-wide, number of YouTube downloads, etc. Reddit no longer shows up on them and neither does Google+.
Even at its peak, Google+ rarely showed up on anything. The media essentially ignored it. It was only mentioned in marketing blogs. Tech media was calling it dead two years after launch, and they repeated that mantra for four years, essentially killing it with self fulfilling prophecy.
Don't get me wrong, I completely recognize the other major blunders which led to its demise; holding strong on the "Google+ as identity layer" was the right approach, and if they'd stuck to that, I think the ecosystem would have benefitted in such a way that it would have driven eventual critical mass.
Reddit is another interesting case study, in that it is one of the single largest drivers of traffic available, responsible for more single link organic traffic than Facebook, and probably only second to Twitter in that aspect, and yet rarely gets any decent coverage. It often only shows up with the shitshow portions of the site raise some pressworthy hell.
Long story short, I find those infographics to be less adequate snapshots of what's happenin online.