1. Don't share any mobile numbers in public, including your own number.
2. Don't share any email id, social accounts in public. (kik, skype, facebook, instagram, etc.)
3. Don't share any 3rd party images which aren't porn images. (Know the difference between, porn images and normal images).
4. Don't share any kind of underage images, videos, links, or not even a JOKE about abusing childs.