* Artificial (LLM-generated) engagement
* Crypto scams (usually one bot asking for a link to the latest money-making trick and another bot replying)
* The now-infamous "M Y _ _ _ _ _ I N B I O")
Additionally I've noticed that almost without exception every ad Twitter has served me for the past few months has been for an AI-generated drop shipping site hawking the same handful of AliExpress products. I can't remember the last time I got an ad for anything resembling a major brand.