Excluding this forum this is the only poll I have seen where it says Hillary won the debate...every focus group and online poll said he won with large margins. Yea they aren't scientific but winning every online poll is kind of a hint.
Bernie always wins online polls. And I mean always. Hillary is leading by 20 points nationally but ive never seen her win an online poll. Sanders supporters are far more likely to be voting in those. So no I dont think they accurately represent opinion so dont be surprised if scientific polls actually show Hillary the debate winner.