It just hasn’t hit that Twitter-level critical mass of users
Twitter used to be bigger than it is now and it also used to have less spam. So clearly size isn't the problem.
The problem with twitter is Musk fired all the people who spent their day figuring out how to hide (or just delete) shitty content.
Emphasis on "small" models. The large ones need over a terabyte of RAM and it has to be high bandwidth (DDR is not fast enough).
And for most tasks, smaller models hallucinate way too often. Even the largest models are only just barely good enough.