Robert_Charlton - 7:41 am on Aug 17, 2013 (gmt 0)
Dunzbumz - Welcome to WebmasterWorld, and sorry to hear the news of your site....
we are running a service website with lots of good quality data. We actually do service for people, but don't charge -- all our monetization is from Adsense.
It's tough when this kind of site gets hit. What jumps out at me in the above characterization of your site is the phrase "lots of good quality data"... with the word "data" deserving particular emphasis.
Increasingly, since the MayDay update back in May 2010, Google has treated curated data as something that isn't unique. Directories and product sites that didn't create their own content have also gotten hit strongly, and you could only get so much mileage out of re-sorting data that was generally out there. And, over time, Google has been raising the bar as it sees it.
I don't know whether this describes your site to any degree. We can't get into specifics at all, nor much detail in this update thread, which is to compare notes... but I'm wondering, if this does describe your site, whether it might also describe others that were hit.