Shilling on social media appeared overnight. Literally a switch was turned on and suddenly hundreds of "totally organic" posts about Bloomberg are popping up everywhere mimicking local forum/board subcultures. Many of the people seem to be posting somewhat ironically, though it seems his campaign has attempted to embrace the same style of "no press is bad press" attention that undoubtedly contributed to Trump's election.
It's pretty gross to watch someone literally buy an election. I hope he fails. But there's a good chance he'll get far, because though he is running as a Democrat, many of his past statements regarding women, minorities, and stop and frisk appeal to the non-PC Republican sentiment that worked in the last election. And you can count on the fact that the average person won't understand that none of this buzz is organic.