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It is important to notice it is from 2009. Many things are outdated.
In some ways that might be an advantage. More people are going through the growing pains associated with tens of millions of people using their site and request-per-second and data size problems, and making trade-offs for that providing service at that scale.

Jumping to Facebook's current architecture and taking on the trade-offs taken there (assuming you even have a problem where those trade-offs make sense at massive scale) is probably not the right thing to do when you are much smaller (in terms of requests/traffic/load, servers, and employees).

Yes, it is true. I just wanted to say it, so everyone knows. Some guys like me are more interested on the Facebook's current architecture so it was important to notice the difference and avoid wrong assumptions.
I'd love to see a 2013 update on some of these numbers.
(comment deleted)
"Haystack is available as open source."

Still waiting on that...

> #2 property on the Internet as measured by the time users spend on the site.

#1 being...? I get it that it's from 2009, but surely even back then Google Search wasn't king "by the time users spend on the site". Maybe GMail ?

#1 was Google, which includes Search, Gmail (found at mail.google.com), Google Docs (found at docs.google.com), etc.