Can we reverse engineer the potential ranking signal that this update targetted?
Out of all my sites, only my major one was hit, the rest were left unscathed in the same vertical. It's an EMD informational site with really great repeat users and loyalty. (But then again it could still be because the end of summer is coming for me).
This algo update could be that...
1. They downplayed or reset the data on user metrics.
2. Downplayed EMD further for certain queries.
3. Reduced the link authority factor from UGC sources like forums?
4. Further penalized any site (or rather "removed boosts") with decent amount of UGC.
I read around the web to get some clues. It seems like both information and commerical site are hit across the board. But it appears that only small to mid businesses are hit. Would anyone else that got hit (or not got hit or even improved) share what is your site generally is about?