LOL this happened to me.
Turns out one of my friends showed some guy my picture and then told him my name.
Second day of school I'm walking down a random hallway and the guy's like, "Oh hi *censored I'm not telling you my name*"
And I say, "Who the heck are you?"
Them, "I'm *censored* and some guy showed me your picture and told me your name."
Me awkwardly walks down the hall