Facebook is a social media platform. It’s most accessed via your profile. Your profile allows you to create pages, friend and be friended (as opposed to likes – see Facebook 101 – Pages) and join groups. It is important to note this especially – you can only join a group from a personal profile.
Facebook’s rules state that you must use your real name and that you can only hold one profile – which has been heavily debated by those who use pen names. Facebook’s use is free – though, you can buy advertising and boost posts on your page.
Facebook’s profile is also often used as a login to other systems.