Forum Moderators: Robert Charlton & goodroi
Matt Cutts and Amit Singhal Share Insider Detail on Panda Update
...we used our standard evaluation system that we've developed, where we basically sent out documents to outside testers. Then we asked the raters questions like: "Would you be comfortable giving this site your credit card? Would you be comfortable giving medicine prescribed by this site to your kids?"
There was an engineer who came up with a rigorous set of questions, everything from. "Do you consider this site to be authoritative? Would it be okay if this was in a magazine? Does this site have excessive ads?"
...we actually came up with a classifier to say, okay, IRS or Wikipedia or New York Times is over on this side, and the low-quality sites are over on this side. And you can really see mathematical reasons.
you look for signals that recreate that same intuition, that same experience that you have as an engineer and that users have. Whenever we look at the most blocked sites, it did match our intuition and experience, but the key is, you also have your experience of the sorts of sites that are going to be adding value for users versus not adding value for users.
Don't forget that the search team and AdSense team are at odds with each other most of the time, probably diametrically opposed in philosophy of what constitutes a "good site".
our classifier that we built this time does a very good job of finding low-quality sites. It was more cautious with mixed-quality sites, because caution is important.
Wired.com: Do you feel that this update has done what you wanted it to do?
Cutts: I would say so. [...]
Singhal: It’s really doing what we said it would do.
Cutts: Which isn’t to say we won’t look at feedback.
Cutts: If someone has a specific question about, for example, why a site dropped, I think it’s fair and justifiable and defensible to tell them why that site dropped. But for example, our most recent algorithm does contain signals that can be gamed. If that one were 100 percent transparent, the bad guys would know how to optimize their way back into the rankings.
Correct. I received an (automated?) email from Adsense today because they noticed that I'm running less than three ad units on my pages. They recommend to add more ad units. It sounds like a bad joke after I lost 40% of my US traffic, possibly because of too many ads in the eyes of Google's search team.
Don't forget that the search team and AdSense team are at odds with each other most of the time, probably diametrically opposed in philosophy of what constitutes a "good site".
Singhal: And based on that, we basically formed some definition of what could be considered low quality. In addition, we launched the Chrome Site Blocker [allowing users to specify sites they wanted blocked from their search results] earlier , and we didn’t use that data in this change. However, we compared and it was 84 percent overlap [between sites downloaded by the Chrome blocker and downgraded by the update]. So that said that we were in the right direction.
the advertising carried by so many of the impacted sites is served by Google
User-agent: googlebot
Disallow: /
Freaking Google! They just sent out emails asking people to add more adsense units.
[edited by: BillyS at 3:00 am (utc) on Mar 4, 2011]
[edited by: browsee at 3:50 am (utc) on Mar 4, 2011]
Just trying to figure out if it's something simple, and I don't think so. The magic bullet isn't obvious.
If it looks too good to be true, it probably is, and now yet another shoe has dropped.
[edited by: limoshawn at 3:38 am (utc) on Mar 4, 2011]
Phaedrus, a teacher of creative and technical writing at a small college, became engrossed in the question of what defines good writing, and what in general defines good, or "quality". His philosophical investigations eventually drove him insane, and he was subjected to electroshock treatment which permanently changed his personality.