These are unscientific polls, and if that poll does not mention it, they do not care much anyway. If there is a funny aspect in the poll, those from 4chan migh

These are unscientific polls, and if that poll does not mention it, they do not care much anyway. If there is a funny aspect in the poll, those from 4chan might pick it up and abuse it for you. Regarding legality, it is up to local cybercrime laws. In practice, you may get in trouble as a knee jerk reaction to some unexpected and unfortunate outcome of the poll.