Friends are those who are more or less dedicated to your matters. Facebook uses the word friend in "adding friend" wrongly. Nobody adding you bothers to concern about your issues. They just add you to post their pictures or links to show you. I don't need to add a ton of strangers for their pictures. I can watch strangers on the street easily. As for those links they post, most are not my interest; I can just follow my interested websites to get their feeds.

So I don't need the function of adding friend in Facebook.

on Facebook, only insincere people talk to you.