JW’s come to your door, because they are commanded to biblically,. Not because it works, but rather they are commanded. Mormon’s do the same, for the same reason.
Can’t really compare facebook to door knocking either. Facebook is more non discriminant about posting your stuff. It’s not in your face, interrupting dinner, TV time, or time with family.
People get marketed to at every turn in today’s world. Most don’t like someone invading their homes to shove something else in the face, to sell.
Coarse, if someone wants to knock on doors, go for it. If it earns you a reputation of being “that guy”, then don’t complain later.