I just read and enjoyed this:
The world never changes quite the way you expect. But at The Verge, we’ve had a front-row seat while technology has permeated every aspect of our lives over the past decade. Some of the resulting moments — and gadgets — arguably defined the decade and the world we live in now.
But others we ate up with popcorn in hand, marveling at just how incredibly hard they flopped.
I would have ranked Google+ much, much higher, at least in the top 10, probably in the top 3, even though it arguably achieved its primary purpose: unifying Google’s account management.