Facebook is a popular free social networking website that allows registered users to create profiles, upload photos and video, send messages and keep in touch with friends, family and colleagues.
Some of the public features are:
- Marketplace – allows members to post, read and respond to classified ads.
- Groups – allows members who have common interests to find each other and interact.
- Events – allows members to publicize an event, invite guests and track who plans to attend.
- Pages – allows members to create and promote a public page built around a specific topic.
- Presence technology – allows members to see which contacts are online and chat.