Historical clue formulations

• Site once promoted with the slogan "A place for friends" — 2025-10-24
• Onetime rival of Facebook — 2016-04-18
• Facebook competitor — 2011-12-20
• News Corporation acquisition of 2005 — 2009-01-29
• News Corporation-owned Web site that's one of the 10 most visited sites in the world — 2007-10-26