"A vote for Johnson is a vote for Hillary!"
"A vote for Johnson is a vote for Trump!"
So you want to vote for the lesser evil, instead of not voting and "letting" those who would choose the greater evil, outnumber those who would choose the lesser evil?
Greater evil in a system that picks evil by default is simply more of the same sooner than otherwise.
Talking with people on Facebook about freedom is not nothing.
Far from it.
What you can do to bring about Real change.
Voting reinforces the notion of the legitimacy of government, so voting is actually the opposite of progress.
Trying to lessen the amount of evil expressed in a system that is evil is a losing battle, and by entering the ring, you're sitting back in the real world and hoping the "more evil" side gives up.
If you want a detailed list of reasons to not vote, here are 20.
And here are some more articles:
Do Not Vote
The Anarchist Case Against Voting and Elections
Voting Anarchists: An Oxymoron or What?
Is Voting an Act of Violence?
The Real Reason Libertarians Don't Matter