First time poster here too.
I have a very high profile site (top 10 most shared site on Pinterest this year). And one of my pages that was shared over 50,000 times that used to rank #1 for it's term is now gone. Nowhere to be found. I have about 50 pages that are very very highly researched, original content that people share like crazy, and they're also nailed by this update. I have no words to express my anger. We put over 40 hours of original research into our top stories.