You should also avoid what is Facebook jail through friend requests. Friend requests are a common way for new Facebook users to get to know one another. Unfortunately, if a person on your friend list invites you to join them in a chat, you are likely to be blocked from using the chat in future. In addition, if you are told to "unfriend" someone on your account, you are likely to receive the same ban. What kind of security measures are necessary to avoid having your account blocked? For information on these and other security measures, you should consult the Facebook Help Center.