All those accounts that i posted are making almost the same post, and they all are posting in the Phillipines local boards, almost at the same time.
They all are suspicius, and i received 2 private messages, but they both made the same mistakes on their spelling and have the same gramatical errors, and only 1 minute of difference between both messages.
You've just described at least half of the Filipino board there, though Filipinos are usually more likely to have an army of alts I've found (haven't looked into the ones you listed but it isn't really concrete evidence).