False! Possibly 90% of people find their friends via the mobile app, which scans their phone contacts and suggests people they might know. Names are not unique, plus there are lots of fake profiles and impersonations - so far, after I've reported hundreds if not thousands, Facebook has never taken down a single phony account I've reported! Many click farms create fake profiles using the same names and existing photos! We used to be able to search by phone number and email, but that option is no longer available. Most of my friends have several profiles because people forget their passwords or get locked out by Facebook's ridiculous policies, so they create new profiles (I have two backup profiles myself as I manage several nonprofit Facebook pages, and when I get punished personally by Facebook, they also punish the community pages I manage). Many of my more active friends have at least one backup Facebook profile in case Facebook puts them in the like/comment jail for some time. The ridiculous thing is having a small nonprofit, which has been verified by Facebook, which has just one admin, and that nonprofit, which is not a personal entity, gets punished by being unable to live stream, for example, while this entity has no violations! But that's how Facebook inflates the number of its users, I guess.