Flashcard Friends is one example of how you can prepare for an exam using online social networks. Users can make or edit online flashcards that summarize class notes, definitions, and materials. The site is free to join, but you don’t have to be a member to access the flashcard exercises. The site offers practice tests or quizzes, as well as features that let students share their flashcards with classmates. Flashcard Friends reinforces classroom lessons for students in an interactive, online learning environment.