The "fake news" narrative is getting old. She didn't lose because of "fake news", she lost because people don't like her and because poor folks don't see Democrats in power and think "my problems will be solved" any more.
No one is going to vote any different based on telling stories about Russian influence, even if they're true stories. And you won't be able to censor the Internet effectively. If you try to, it will backfire on you.
If you want the next Democrat candidate to win, here's a suggestion for Democrats: help people. Don't just pick fights. Don't just point and jeer. Actually do something to genuinely help. Do it with a motivation to help rather than to get even with people you hate and maybe help someone in the process. Help Americans to get votes from Americans. Help a broad, inclusive population of people if you want votes from a broad population of people.
If you don't want Democrats to win, then just keep fighting. Keep calling everyone a racist or some other name. Cater exclusively to SJW crybullys who want to scream about transgenger microaggressions and cultural appropriation. Keep doing nothing for regular people. And keep telling yourself you lost because of "fake news".