Depends on platform. 

Dropped FB 10 years ago. Screaming virtue signalling arguements and algorithmic Bs def negative

Tested twitter 2 years ago, followed people on both sides of contentious topics and tried to engage in an open, sincere manner. Definitely not worth trying. Twitter is about embedded camps of opinion with constant toxicity. When the algos started throwing vids of people dying at me, off straight away. Negative

Nostr is memes, comedy, shit posts and positivity but too engrossing sometimes as a result. That maybe cause it gives hope so I’d have to say net positive. I do love the supportive nature here. Not sure I can think of another platform where people share posts by strangers suffering depression or tough times and results in a stream of positive encouragement. That’s what humanity should be