Bebo (pronounced /?bi'bo?/) is a social networking website, designed to allow friends to communicate in various ways. It has developed into an online community where users can post pictures, write blogs and send messages to one another, and is similar in format to MySpace, Xanga, and Yahoo! 360. The site was founded in January 2005 by Michael Birch and his wife, Xochi Birch. It was given a major relaunch in July of that year.

Bebo is the 99th most popular English-language website (at 12 April 2007) according to Alexa Internet. In the United States, Bebo was the fastest growing social networking site in June 2006 according to Hitwise, Inc. Bebo also announced on March 17, 2007 that it was the most popular website in the Republic of Ireland. Bebo as a keyword was also listed as the number one term most representative of search trends on Google in 2006.

Once a user has registered an account, they edit and maintain their own profile page using online forms. The top of a user's profile contains information about the user, which would typically include their name, a picture, a paragraph about them, and some miscellaneous information under various headings. Although default headings are provided, many users create their own to reflect their own interests, or to include quips, quotes, jokes, or gibes.