walkman - 1:11 am on Jun 14, 2011 (gmt 0)
Walkman, I mentioned in [webmasterworld.com...] that one of my sites that was hit by Panda 2.0 was one that I used as a test. I removed all ads (adsense), and it did recover, 3 days later. It is a seasonal site, so I cannot use traffic as a metric, but the rankings recovered to near pre-Panda levels. In other words, it recovered rankings almost completely, but there were a couple of phrases that came back almost to pre-Panda, but not quite. Hard to quantify as a %, sorry. On another seasonal site (different season), I tested removing some of the ads, and making one of the big block ads into a small block ad. That site had partial recovery. I never felt like anyone really believed this scenario, so I haven't shouted about it much. Still, both of those sites I tested on were hit by Panda 2.0, not 1.0. For some reason, I think 2.0+ have a better chance of recovery (from whatever changes are made) than 1.0 sites have. Just my opinion, of course.
Very interesting, so Google answered 3 days later and no need to wait for the Panda monthly, or so, runs. If my pandalized site had ads, I'd remove them to test, but it doesn't. My non-pandalized sites do but it's one block at the bottom of the page and they're doing better than ever. Yes, ads were noticed almost instantly, along with too many tags as soon as Panda hit.
Brinked, duplicate content or lack of it seems to have hit e-commerce and other sites. Among other possible things of course.