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A person you know by email or chat, but would probably trip over them in the street and still not know who they were.
'Hey, I know you from Facebook!' 'Oh, that guy who never replies to my messages.'
'She messaged me once. That’s it. I don’t even know her name.'
'He’s my e-cquaintance. We’ve never talked in real life, and I’d probably punch him if I saw him at a party.'