Alexa traffic rankings depend on users who have installed the alexa spyware browser toolbar. They are often cited as being only approximate. I wouldn't be surprised if there was just some kind of measurement error or mass adjustment on that day. posted by Rhomboid at 12:43 AM on June 21, 2006
Alexa changed their ranking system somehow. There was actually a metatalk thread about it when it happened, and matt said that there wasn't any more traffic.
One thing I did just notice is that alexa now ranks different blogs on blogspot separately, rather then all being part of one mega-popular site. posted by delmoi at 12:52 AM on June 21, 2006
Flickr also has a huge jump at the same time. posted by delmoi at 12:53 AM on June 21, 2006
digg.com is another site with a similar spike posted by delmoi at 12:55 AM on June 21, 2006
And so is del.icio.us. It seems like a lot of sites like that got a spike that day. posted by delmoi at 12:58 AM on June 21, 2006
Can someone explain the metrics of those graphs? What does "daily reach (per million)" mean? posted by loquacious at 1:00 AM on June 21, 2006
This is a total guess, and I haven't read the link above, but it strikes me that Alexa may have, on this date, added another system of monitoring to their arsenal, thus increasing their total input in numbers. posted by armoured-ant at 2:30 AM on June 21, 2006
Some searching yeilds somediscussion of this spike elsewhere on the Internets, with a lot of speculation, but no official answers. A Wikipedia statistics page mentions that Alexa introduced by-country rankings in April. Maybe this change meant there was an algorithm change? posted by Plutor at 5:33 AM on June 21, 2006
That was the official date for Web 2.0 activation. posted by Krrrlson at 7:24 AM on June 21, 2006
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spywarebrowser toolbar. They are often cited as being only approximate. I wouldn't be surprised if there was just some kind of measurement error or mass adjustment on that day.posted by Rhomboid at 12:43 AM on June 21, 2006