This site currently has a friends tag and a close-friends tag. Yes, close friends is slightly different from friends. But tags exist to help people find questions. Are there really a lot of people who want to answer questions about close friends but not friends? Personally, if I was interested in answering questions about friendships, I wouldn't care that much about differentiating between the two.
2 Answers
Agreed. I think a more productive way to set things up is acquaintances and friends.
I would really differentiate between friends and close-friends.
The way you handle things basically different between who you call friends, close-friends, and acquaintances. You can be more direct and open to close friends than to just friends.
A perfect example:
What is the politest way to tell someone their breath smells?
To close friends
Move closer, and hint that their breath smells without drawing others' attention to it.
To not-so-close friends
Probably stand a little further away, and hope they sense why I did that.
To coworkers
Depends on how friendly we are. Refer the abovementioned.
To siblings
No limit on what I'd say; but not in public though. No formalities.
To strangers
Don't mention it. I'd do what I came to do, and move away.
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1Again, tags are supposed to help people find questions to answer. They aren't supposed to communicate all of the details in a question. Communicating crucial but small details, like if the friend is a close friend, is the job of the text of the question itself.– user288Aug 4, 2017 at 17:15
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1And even though you may categorise the people you know into those categories, there's no reason to think anyone else would use identical categories, or that they'd understand the category labels exactly how you do. Aug 5, 2017 at 15:53