Why do girls take secret pictures of guys in public?

I have noticed some girls taking pictures of me in public, it has happned at the gym and at work? I know they are taking pictures because they hold their phone in a weird direction, angle it towards me and hit the phone in the lower middle part of the screen to take a picture. I am assuming it is to show their friends? I pretend like I dont notice so it is not awk.

Why do girls take secret pictures of guys in public?
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