There was a lot of false and misleading information distributed online during this election, and literally spoken by the candidates (one more than another).
The biggest lie is actually at the heart of Trump's campaign, that he can bring back the jobs. Those jobs he's talking about haven't just been outsourced to other countries, in many cases they have been automated into oblivion. Trump promised to bring these back, but how can you bring something back that doesn't exist?
Mind you the Dems and Clinton had no substantial story to weave for the people that are hurting from the lack of these jobs. So people chose the fiction over no substantive story. It's an uncomfortable thing to tell people that everything they know is irrrelevent in the modern economy.