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They are not serving 150 million concurrent users. They have 150 million active users. As in, people who do in fact use twitter at all, as opposed to the millions of dead accounts nobody touches. They are not all being served at once.

Do you hit the disk when somebody, say, checks my Twitter profile that I haven't updated since 2008? What will that do to your performance?

I'm not sure why you are asking me about this.

Because he/she hasn't read the article.

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