No, I think people making bombs is a much bigger threat than people saying fake shit on Facebook. The simple fix to social media manipulation is teaching your citizens to think critically, rather than blindly believing bullshit propaganda. The
point is that fearmongering about the widespread use of Facebook is ridiculous, because the standard of "threat to democracy" that you're using can be achieved by basically
anyone. The specific example I was hinting at with the fertilizer example was Timothy McVeigh. A random dude, working with a grand total of three other people, using fertilizer to make a bomb, and blowing up a government building in Oklahoma City. Four people, a truck, and some fertilizer. It doesn't take much.