Thanks for many requests!
Finally, you can make your code "private".
Touch the "Properties" button next to the code title, in code edit view.
You'll see a dialog to edit code properties,
check the "Private" checkbox, and "Save".
"Private" code won't appear in code ranking, nor in your followers dashboard( or mypage). It will only be visible by yourself.
Use it for drafts, or secret hacks:)