For example, I am in Spain and can legally drink here. In the United States, I can't drink because I am under 21. Someone who doesn't know that I am living in Spain might think that I am partaking in illegal activities if I put up pictures with alcohol in them.
I also am always conscious of the fact that my future and current employers may see my Facebook pictures. Honestly, I will probably get rid of a lot of my Facebook pictures at the end of college in order to appear more professional and mature. Especially if I am going to be a high school teacher, I will be sure to be wary of my Facebook activities and ensure that I am always displaying my most positive attributes.