3. Facebook
Facebook is one of the most brilliant and easiest ways to get information about someone. There's no need to take out the detective hat and look for little strands of information about you around the deep edges of the internet while Facebook probably has a gigantic treasure box of information about you, all in one place for viewing convenience.
The way people usually use Facebook to cyber-stalk or cyber-spy on people is usually the simple "friend request method" in which you simply request a friend request in order to get access to your photos, statuses, and inner thoughts. The people most commonly susceptible to this method are those who try to get 1,000 friends online to make themselves seem more popular and social to their real friends. However, even tech-savvy internet users can still fall prey to this simple con.
It won't always be this obvious.