If stylometric analysis runs on all comments on the internet then yeah.
Bad things will happen, very very bad.
I honestly think it should be at least illegal to do this kind of analysis because it'll be a treasure trove for the commercial sector to mine this data correlated to real people not to think of the destruction in millions of people with personal anonymous blogs etc.
Actually thinking about it further you could also easily group people political affiliations, and all kinds of other thoughts, dark, dark stuff!