What does it mean when a guy buys you a drink?

trickstir85
Last night, I went for a friend's birthday to a local 'Irish style' bar. A friend of hers who I have never met before bought me a beer (I didn't hint or ask for drink).he simply decided to buy me one. I was wondering if buying a drink for a girl is a definite flirting sign, or just a good old fashioned kind gesture. Thoughts, anyone? Appreciate if some guys could answer this question.
What does it mean when a guy buys you a drink?
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