it’s not perfect and the numbers are a bit wrong, but i’m not gonna do better today: here’s the fediverse.network 2018 report ? !
tl;dr: ~ +58% instances (+1,583), +39% users (+688,565), +70% statuses (+89,020,828)
i’ll expand the report over the coming days with more interesting stuff, do not hesitate to send some feedback with ideas/.. :)