I remember the day they introduced the chronological newsfeed! People were pissed about that. Nobody wanted a list of all their wall posts to be published to everyone who could see them.

Prior to newsfeed, FB was obviously an N-N platform, but the interactions were more 1-1. You used the network to find and connect, but you interacted with individuals (on their wall). The newsfeed tipped the focus toward 1-N interactions, and direct messages solidified that (no more wall posts).