A Facebook “like” will, all by itself, never sell a car. Ever. And Facebook, alone, won’t “sell” a car.
Just like a telephone, all by itself, won’t sell a car…unless it is in the hands of a talented, knowledgeable salesperson.
But that’s not a comment on the limitations of either Facebook or a telephone. It simply speaks to the importance of marketing savvy, no matter what the medium is.