Always keep your profile on private. If you keep it on public anybody can view your profile. It is dangerous to have your profile on public also because somebody can track you down or see where your photos are taken. Also be sure to not say where you are at like if you post a photo like " I love my new house on (Your address) in Grand Island Nebraska." Make sure when your posting photos to turn map off because It shows the exact address of where you posted the photo. Also on websites such as Instagram that when you have your profile on private and a random person request to follow you make sure to decline that person and if you want to block them so they can't retry to follow you.