I agree that Twitter is a sewer to the extent that one reads the comments or the tweets of twits. However, as a bulletin board that allows for cutting out the gatekeepers (media, corporate, government, self-appointed judges of the quality of discourse...), it is genius and invaluable IMO. It has been a tremendous tool for Pres Trump. The danger, currently materializing, is that under the guise of cleaning it up, we will be left with a filtered and censored Twitter. Speech where someone else, particularly someone working for the government or big business, decides which speech is hateful, harassing, beyond the pale... is not free speech.
MORE free speech
That is until Twitter itself becomes a gatekeeper.