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Isn't that a plot of people who search Google for the term "google"? If so, I imagine it's something people who are familiar with computers and the internet do not do often.

No comparable web properties have the dropoff that Facebook has (twitter, eBay, craigslist, even Yahoo which seems to be fading faster into irrelevance by the day).

Maybe Google did peak and now people are treating search engines as some white-label service that they're utterly indifferent to the provider of.