Once It's On The Internet It's There Forever

This is a very true statement. You hear everyday in the news about information that has caused embarrassment and physical harm to people who have shared pictures and personal information about themselves. When you're writing about things you have done or sharing pictures, think about how your parents, siblings and teachers will feel about you if they find this information.  Just remember this stuff can't be retrieved once in someone else's position.  You may not be looking for a job right now, but a potential boss can find this years later and it could cost you getting a good job.