Scott Alexander linked to this very clever proposal by Scott Aaronson: In order to stop Trump, people in “safe” states coordinate with Johnson or Stein supporters in swing states. The people in safe states vote for the appropriate 3rd party candidate (so that nationally Johnson or Stein gets the same number of votes, which is what their supporters care about), while the J/S supporters in the swing states for Clinton, where it really matters in the main race.
Whether you detest Clinton more than Trump, it’s undeniably a clever idea. (Apparently it’s legal, too–“which is nice.”)
But as I said on Facebook: Now just up the ante: I propose that Clinton and Trump voters in the same state find each other, agree NOT to vote, and use that time instead to pick up litter.