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.
A popular free video-sharing website that lets registered users upload and share video clips online at the YouTube.com Web site. To view the videos you are not required to register.
Twitter is a free service that allows anyone to say almost anything to anybody in 140 characters or less. You can state your thoughts, views, opinions and links, but in a super-compact way, affectionately known as a tweet.
LinkedIn is a social network for businesspeople. It allows users to create a professional profile, list their present and past employment, and link up with former and current colleagues. It also allows users to stay in touch with clients, vendors, suppliers and other business contacts.
Pinterest is a social network that allows users to share, organize and discover new interests by posting (also called pinning) images or videos to their own or other’s pinboard. Pinboard is a collection of things usually with a common theme.