Not only that, by lack of any declaration in every post, these posts of users are public domain.
No, any work you create is automatically copyright to you. This post, for instance, is owned by you. l0k1. My reply is owned by me. Tomz.
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No, because to share it other people copy it and put it on their computer in some way, means you have given it away to the public. That makes it public domain.
You cannot however make a copy of it and claim that you said it. My copy stands predating it, certified by miners, already on the blockchain. Anyone can look it up and see that you are lying.