It's highly likely that it's a system being operated by one person.
By quick look it looks like at least these accounts are involved:
https://steemd.com/@lucreces
https://steemd.com/@falconcash?page=25
https://steemd.com/@jepphil
@berniesanders want to take a look?
That's what I would assume...
I've seen it plenty of times on here from these acounts
I never bother with it unless I see it on posts of mine or friends of mine