Daily Dot has a very good piece on how the members of a subreddit and 4chan got together and bombarded all the online polls to make it look like Trump won.
4chan and Reddit Manipulated Online Polls to Declare Trump the Debate Winner | The Daily Dot
I guess it doesn't really matter. The proof will be in the polls that come out later this week. If one or the other candidate gets a bump we can say they likely won the debate in the eyes of the people.