Its a progressive tactic called “Manufactured consent”. Basically to make you feel wildly outnumbered by posting all over the place.
Watch the national popular vote threads posted here at FR. There’s one poster who posts the exact word for word things all over the internet under multiple names.
Which in turn is a greatly expanded and enhanced variation of the old Communist "Diamond Tactic" of turning over crowds.
How Collectivists Use the Diamond Tactic To Sway Public Meetings and How to Thwart Them