Hello-
For years, I had a page which was producing good traffic, earlier this year, the traffic started to collapse. I assumed it was part of the side effects of Google's updates, changes, etc... However, while researching deeper, I noted that this page is now outranked by a page from the site Quora. A page which was created 3 years after mine, and which look-a-like my content. Same title, and the "answers" terribly look like a sum-up of my page including the comments left by visitors of my site.
So I looked deeper, and I see that lot of my pages, now have an "equivalent" at Quora , all these similar pages, were created last December.
Coincidence?
I don't pretend to claim the exclusivity of the subjects of these pages, and I am fine with people taking their "inspiration" form my content to build their own. Honest people would at least put a link or mention from where they get the information , as I do myself... but with Quora it still to be mass copying, and of course without any credits back.
And of-course Quora is outranking me everywhere now.