Facebook is a social network where people connect with friends and companies. It can be used for communication and sharing content. There are personal profiles for individuals and business fan pages for companies. Tips include starting with a personal profile, determining if business and personal profiles will be mixed or separated, and using a business fan page that does not show personal information. Facebook offers tools for businesses to engage with customers, advertise, and gain insights into their fan base. Proper use involves regular posting, responding to fans, and avoiding spamming or self-promotion only.