Just trying to distinguish between the medium and the message here:
YouTube is capable of carrying good, interesting and/or useful content and not biased against it.
Facebook is designed primarily for social content and it is full of trivia with no value other than social bonding.
Twitter is, by virtue (if that's the right word) of its design, almost incapable of anything other than ephemeral trivia.
Life is too short to waste on mental junk-food.