Before you repost something that made you furious, ask who benefits from you being mad.

Outrage travels further than anything else, which means plenty of what reaches you was built to produce the exact reaction you are having. Somebody gains from the sharing: attention, money, a political point, a fight that keeps the numbers up. Your anger can be completely sincere and still be the product.

Put a short delay between the feeling and the repost, even ten minutes. In that gap, check whether it is true, where it came from, and who profits if it spreads. If you still want to share it, do, and now it is your decision rather than a reflex somebody else engineered.