Best thing we can do is learn to turn our attention inwards, learn logical fallacies/critical thinking and remind ourselves not to trust everything we read or see.
Sometimes through fallacy, you can "guess" the truth, for it is in the subtext. The most one want `s to hide something, the more you can guess what`s behind.
But, yes, anything we read can be a lie or a partial vision of some truth, so to be careful and to develop a critical mindset is totally necessary in this crazy world!!