What's the Difference Between Flirting and Just Being Friendly?

A real mystery
A real mystery
I ask because I really do not know (I have trouble reading body language). How can you tell when someone is being more than just friendly, and actually flirting? Are there "signs" you have to be able to see? What should I look out for?
What's the Difference Between Flirting and Just Being Friendly?
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