I wrote an open source application that uses Webdriver to scrape tweets; it used to show how heavily Twitter censors all kinds of users. Twitter used to have a tweet's "quality" (per them) right in the HTML: "HighQuality", "LowQuality", and "AbusiveQuality". They put some tweets in the "tombstone" section. I now need to change the app to deal with them obfuscating the "quality" and all the rest.

I've run a Twitter ad for the app so at least someone there knows about it. I don't know if the app was a factor, but certainly hiding what they think of their users' output is in line with all the other sneaky things they do to their users.