Strongly disagree. You are allowed to create/do things that no one else know about. Share it if you want, keep it to yourself if you don't. Don't let other people dictate to you what you must do in order to be satisfied with yourself.
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People put a lot of effort in stuff they do in the hope that somebody will find it useful, will give them some praise, and maybe even some money. That stuff doesn't tend to happen if you don't talk about your stuff. Build it and they'll come usually doesn't work.