[ahepp]

I don't think there are any easy answers.

If you don't filter, best case scenario your SNR is going to be too low. There's also a pretty good chance that you will end up with a GIGO situation because all you hear about is whatever cable news, Cambridge Analytica, and Amazon's twitter astroturfing squad are pushing today.

If you do filter, you're correct that it opens the door to all kinds of biases.