I suspect that you've hit the nail on the head. It would also be interesting to see numbers on churn. How long do these many close friendships last? Do they last longer than before? Or, more likely, less long?
Although, I’ve also got some college friends that I’d consider close. So that’s more like 15 years. Also online mostly at this point.
I dunno. It isn’t well defined I think. We come with built-in accelerators for social interactions, right? It runs some weird proprietary language I guess, the rest of my brain can’t make heads or tails of it.
I think this one is interesting. If you saw them daily for 20 years and then transitioned to once a year are they automatically not close friends? Even if they satisfied the other criteria (like you could turn to them when you are facing a serious problem, you have deep conversations on that annual meeting because you are comfortable with them, etc)?
The term 'close' friend at least to me means close. Either in physicality or depth and regularity of contact.
Only talking to them once a year, even in depth is more like a semi-close friend. They are not there to help you with the day to day issues that you may not even realize you're having.
That's my criteria anyways...