Girls, when you post photos revealing your body on social media, what's the reason?

Lately I've been realizing that it's very common to find girls posting photos revealing their bodies on social media, including bikini pictures, turning on purpose the bum to the camera or focusing the camera on the breasts. While I don't think it has necessarily a sexual or romantic meaning, I do think they're trying to achieve something by showing their bodies like this, and I wonder what's the reason behind that.
Girls, when you post photos revealing your body on social media, what's the reason?
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