Are there projects you don't post about? Or tell people about?

I know I have 3 or 4 projects running in the background that I have never posted about on here, and may never post about and it made me think, how many others do the same.

My personal reason is because I have said the smallest things in passing and days later, they have been taken and run with by other users. I take most forum talk as public domain in terms of, once you say it, people will use it as if it was posted for their personal research and development.