Facebook is living proof of the George Carlin axiom: "Never underestimate the power of stupid people in large numbers."
It seems to be the bastion of ignorant people, unfortunately giving them a voice and a support network. Hence the lunatic fringe of superstitious and paranoid conspiracy theorists continues to burgeon in the petrie dish of social media.
Upshot: 55.2 is certainly more accurate and understandable than 55.5.
55-2 or 55/2 might be even better.
