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Both Stack Overflow and The Hyphenated Site (EE) sites are affected, EE in fact goes way down and Super User also notices a drop after reaching a record in the same time while Stack Overflow goes sharply down.

What happened? A new player on the market?

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I swore there was a blog post about this, but now I can't find it – Michael Mrozek Nov 1 '11 at 19:29
I think you're overestimating the decline of Super User, especially given that its traffic still is higher than most of the previous months, I would only be worried if it kept declining, which doesn't seem to happen. Oh and stop using Alexa, Stack Exchange is a verified Quantcast client – Ivo Flipse Nov 2 '11 at 11:06
up vote 14 down vote accepted

I just went to Hacker News, and one of the top stories was an article about this happening to the hyphen site. How convenient. The author observed that...

That vertical line is around April 2011, which is when Google rolled out its "High Quality Sites Algorithm".

This correlates well with the drops for the hyphen site and Stack Overflow, but doesn't match up with Super User's.

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There have been several Panda updates and SU's might align with one of the others, however it seems to have picked up its steam again since the first changes – Ivo Flipse Nov 2 '11 at 11:07

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