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A person who shows up at a bar or club and you swear you know them, but you can't remember why. Later you realize you've been friends with them on Facebook for years, or you've been looking at their pictures like a creepy stalker.
I saw this guy at the bar and thought, 'I know you!' Then I realized I've been friends with him on Facebook since 2014.
I saw a girl at the club and thought I knew her. Turns out I've been stalking her Facebook for two years.
I walked into a club and saw someone I thought was my ex. Turns out I just followed them on Facebook.