It's also somewhat interesting that text wouldn't necessary be as revealing as the language quiz from the article; when I type "aunt", readers have no idea how I pronounce it (but that is just picking at the specific to ignore the general, identity characteristics leak out all over the place).
From the language survey, there were quite a few questions dealing with word choice (e.g., coke, soda, pop). There are also algorithms that can predict, with varying levels of accuracy, the writer's gender [1]. Combine these with browser font identification [2], geolocation [3], and other comparable data, and lying or omitting data isn't going to provide much in the way of anonymizing you or your data.
[1] http://www.hackerfactor.com/GenderGuesser.php
I get that you are just elaborating on data leakage, I just don't understand the style you chose to do it in. "identity characteristics leak out all over the place" isn't exactly a brazen declaration of how easy it is to stay anonymous.
Context also matters a lot. If there is no obvious path to an IP or browser interaction, all that stuff goes away.