I've definitely seen Facebook posts that appear to be weaponised alignment with one particular view I happen to agree with, but which really just seem to be there to stir up conflict and create division.

It's gotten to the point that I don't really trust anyone on Facebook in certain contexts - although I'm more likely to trust someone if their position shows some flexibility and avoids purely tribal thinking, and also if they show some evidence of background knowledge and general thoughtfulness.

I'm less likely to trust anyone whose position encourages extreme polarisation, who appears to be disguising intent, whose posts are repetitive, and who tend towards inflammatory emotive language and insinuation.

This isn't infallible and I know I've made mistakes in both directions. But I hope it's better than just getting astroturfed.

Edit: I don't think critical thinking skills help as much as they should. This isn't about assessing evidence, it's about assessing intent - which is a different problem.