Social networks are social structures composed of groups connected by relationships. Facebook began as a platform for college students and later expanded. Tuenti is a Spanish social network for those over 14 to create profiles, add friends, share messages and media. Twitter started as an internal project in 2006 and launched publicly that October as a platform for short messages. Blogs are regularly updated websites that collect chronological articles from one or more authors with the most recent first. Myspace is a social network owned by Specific Media and Justin Timberlake, launched in 2003. Yahoo was founded in 1994 and incorporated in 1995, headquartered in California.