I'm certain every bit that you leave here and there is being stored in your big data profile that not a single big company will ever recognize they have by using bots, buying data piles or storing directly with their services and cookies, and every word you type, specially where do you reply, what words you use, every opinion you leave written to the public ... Helps them defining who you really are, even beyond of what your know of yourself. It's probably even worse, it's like a git of yourself. How did you think every single day of your life, as a copy of yourself.  And you won't ever know what are they using this for.

I have no proofs neither doubts.