Off topic I guess, but to me Quora seems to have passed it's peak for updates to topics which I find interesting, unfortunately. I was not an early adopter, and joined when the gated-community phase ended, selected my topics and enjoyed quite a few good answers. A week later I opened it up on a train ride, but the content had not changed at all.

And, perhaps more tellingly, in each topic the few scraps of fresh activity each time I've opened the app since have been from exactly the same users.