Re: ...to see how anonymous you are on the Internet.
Part I (due to 2,000 char limitation per post...)
No, I think you could be mistaken.
Our writing styles identify us. When keyloggers get into our machines, then every press or release of keys with time intervals monitored reveals who we are. Some type blindingly fast and edit after the fact. Many type while thinking, pause, edit mid-stream, and alter chunks of text.
Those who do not use TOR, and who log in to sites, and receive HTML or crawler-infested content-rich messages on our desktops, laptops, and wireless devices, the cookies/bots/crawlers/pixels/invisible overlays, our typing/pausing/word-choice patterns, and our rather limited log-in times and locations will give away who we are.
Oh, and, many of us repeatedly recall anecdotes, and pretty much tie us to posts we make in other forums, too. But, since some enjoy competition, personalities will be part of dissemination. At some point, as normally-non-detectable agitator, whistle-blower, or Good Samaritan will out him/herself.