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Agree, the author missed the sarcasm in the post she was replying to.

I think it is a valid use of the word "bubble." Think "search bubble," not "housing bubble."

It's a valid use but, given the context, it may have been click-bait. I've heard the term 'culture bubble' before, and I think that would have been more appropriate, especially when the concept of an economic bubble around Silicon Valley is already being talked about.

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