Notoriously busy-looking site

• Once-popular social network
• Onetime rival of Facebook
• News Corporation-owned Web site that's one of the 10 most visited sites in the world
• News Corporation acquisition of 2005
• "A Place for Friends"
• Facebook competitor
• Popular social networking site, and this puzzle's theme
• Big name in networking

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
social networking Web site, founded in late 2003.