Many people here write similarly, but a lot of people have unique quirks in their writing style which make it easy for non-experts (like us) to link them to other pseudonymous identities, like other forum accounts they've used. I've seen it happen on a few occasions, like with mtljohn and chaosforpeace. Experts using statistical analyses should fair much better than us. The only thing is, in order to learn your real identity, they would have to link your writing to things you wrote under your real identity. I hope no high profile members of this community ever kept a blog on a server that still has their IP address. Don't write long-winded posts on reddit over clearnet, either.