Generally, unless you're sure it's you, it's probably your tulpa. It can be hard to tell when your tulpa is talking (mine was apparently vocal for a week before I figured it out, as she later told me...), but if you have confidence in your tulpa, they can become vocal pretty early.
Every time I make a post, I always Ctrl+A Ctrl+C in case something happens when trying to post and the message disappears. I guess I was talking about tulpas last online. I think this was earlier on Reddit.