I must say the S. Francisco is a very nice place. But everything seems to be moving there. But why all this concentration of things? The internet promised us the freedom to be anywhere in the real world and at the same time work anywhere.
Now it is Wikimedia. Lets do a nice backup every once in a while just to be safe from earthquakes.

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Paul Graham has an interesting explanation for that:
http://paulgraham.com/startuphubs.html
Yes, but the argument Paul uses is for startup companies. Wikimedia is a startup? Maybe they are just starting to have a view of possible self sustained model, in that case going to a incubator hub makes all sense.