@Tom4hawk Well, a number of reasons, in my opinion:
1. most friends don't actually compliment one another in detail very much because it's a bit embarrassing
2. if you think someone's great at something, you may not feel close enough to them to tell them that without it feeling creepy, even if you are acquainted
3. being complimented is nice. It's a good pick-me-up for someone to hear nice things about themselves without having to worry about ulterior motives
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