To check facts you take two steps: Embed them in a theory. Try to measure the unknowns from the theory. These steps are easy in common tasks (mass is preserved so you can put stuff on the scale), but most political facts are a bit note complicated (that's what makes them political)
Arguing on social media is fun because you get to know the thoughts of people you don't agree with. If a candidate sends in a lot of paid trolls, you'll get an bad impression of her followers. Recycling a limited amount of talking points makes you look very stupid.