Everything that you post online becomes part of your public, permanent and searchable reputation. Even if you send a private message or photo to someone else, you can never be certain that they won’t duplicate it, alter it, or post it without your consent. Once an inappropriate photo is leaked, it is nearly impossible to undo the damage done.
College and university admissions officers as well as employers looking to hire new talent will always GOOGLE you before they meet you to see what your digital reputation looks like. Sports coaches who are thinking about recruiting you for a team will be doing the same. Beyond that, they will look on social media to see how you represent yourself online. Be ready for this. Post positive and thoughtful posts that exemplify how you want people to perceive you!