I think maybe twitter is bias toward promoting tensions, because people love to have the emotional outlet to complain and be heard. It's just instinct. Spouses often go home and vent to each other about their drama/stress. Using your audience on twitter is no different. Just a basic need to be heard and validated. The top posts on reddit's "ask reddit" forum are usually "what do you hate about ___".

Perhaps instagram is immune to that because it's harder to articulate the "I'm angry" emotion with a camera ?