Facebook is a social network that allows users over 13 to connect with friends, share photos and videos, and join groups and networks. However, anything posted can be viewed by others and remain online permanently. The document warns that users should be careful about what they post as future employers or others could find posts, photos, and information. It also notes that as search engines now index Facebook, users' digital footprints detailing their online activity and connections are visible to the public. Users are advised to closely manage their privacy settings and be aware of how much they are sharing online.