fathom - 4:29 am on Apr 16, 2012 (gmt 0)
A thin page may not be what you think.
Huge article websites lost massively due to PANDA where article pages have lots of text. The quantity of pages compared to the available link juice is the problem.
Thin is a metaphoric description.
WebmasterWorld itself has also been effected by PANDA... the difference... repetitive pages that don't deserve ranks are not naturally promoted.
e.g. "I lost my ranks" threads get indexed but are buried below the mix of WebmasterWorld quality threads.
An educated guess WebmasterWorld has be harmed just like you out of 2 million threads (a guess) WebmasterWorld gets traffic on say 10% of them... the fact that they always got that means they were pre-PANDAized and it wasn't a huge problem because they didn't rely on traffic from "I lost my traffic Jan 12, 2011" & "I lost my ranks Nov 1, 2009"... that's the difference.
All domains are the same we have all been PANDAized some just feel the effects more than others because of (for lack of better words) regurgitated pages to target every longtail phrase was the model of choice... but now it does not work.
That said... all the pages are still there (indexed) and if they deserved ranks they would each have a few links to them. Granted you can't develop 3 million links for 1 million pages but you don't need to... just pick your ponies wisely.