I think he won indirectly because of Facebook. The real powers behind the meme magic on Facebook were /pol/ and /r/The_Donald. This is evidenced by the amazing growth rate of /r/The_Donald and the huge traffic to and support from /pol/.

And I don't think misinformation won Donald the presidency. The main theme pushed by the two forums I mentioned was that Hillary and the DNC were extremely corrupt. Every new WikiLeaks release was scoured by /pol/; there were daily /cfg/ (Clinton Foundation general) threads on /pol/ in which tons of anons investigated the corruption of the Clinton Foundation and then made memes and organized social media movements about their findings.

It wasn't misinformation that won Donald he presidency, it was the organized effort of people trying to expose corruption. Whether the corruption was over-exaggerated is another story.