Funny! I take it you're looking at old high school friends, people who you wonder "What happened to them?" Is that really snooping if they are on FB?
Like the others said, that program is a scam, so don't worry about it. Some people don't have tight security measures on their FB, so you can see everything they do and say. If it's like that, you certainly shouldn't worry about looking at it. If they DO have tight security, you can't see anyway.
Don't feel so guilty! If you weren't planning on trying to scam their credit card or stalk them by writing as someone else telling them you know who they are and "what they did" (like in the slasher movie), then you don't have to feel guilty. It's only when you actively hate someone and try to stalk them on FB, tell them that you can find them anywhere and harbor ill will in your heart by making them worry that you will try to hurt them, that you are doing something wrong.
Dawn