All of the status-seeking behaviors the researchers describe existed before Likes, but by gamifying social status Facebook threw gasoline on the narcissism fire.
And yes, Facebook didn’t invent the like button (that was Friendfeed) but they made it a standard.
Also worth noting that a key component of Facebook’s initial positioning was that it did NOT have any gamified counters, unlike MySpace and Bebo which were fueled by profile views and friend counts.
Source: was Bebo engineer/exec 2007.