Mame, I understand what you're saying and yes, there is a big difference between someone I knew 20+ years ago and probably hadn't seen or spoken to in about the same time compared to someone I went to / go to church with, was in their wedding, talked to on the regular, hung out with, still ran into, etc.
Let me put a spin on it. The term "best friends." what do you classify as a best friend? You knew them in school or someone you grew up with in the neighborhood, but you haven't seen or spoken to in multiple years. Would you still call them a best friend or just a friend? My wife, as I've mentioned before, has zero friends. No one she calls on the regular, hangs out with, goes to girls night out or take girl trips with. Would you call someone you are linked with on Facebook but haven't seen or spoke with in some 20 years a best friend? There are people I grew up with I consider a close friend but not a best friend.
How would you classify someone as a best friend?