This is what happens when startups strive to “do well by doing good” but they only understand what “doing well” means, which is making a lot of money. “Doing good,” they believe, will eventually be defined by users. This is how Twitter’s model evolved into the cesspool you did such a fine job of portraying here, and Facebook’s business model evolved into using other people’s content without paying for it.
I started suspecting that Twitter and Facebook were both negatively affecting my mood. I dumped both and am much happier for it. The drip-by-drip exposure of their amoral practices continues to validate that decision.