When WIRED introduced Facebook to its online readers in 2004, four months after Mark Zuckerberg launched the site with a few friends out of his Harvard dorm room, the first order of business was explaining the poke. “On Thefacebook, poking is a way of saying ‘hi’ to would-be contacts, a method to strike up a conversation without adding the person as a friend,” went the post. “And there's quite a bit of poking going on.

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