Historical clue formulations

• Look up, in a way — 2022-04-16
• It uses the PageRank algorithm — 2017-06-04
• Bing competitor — 2014-03-10
• Search for, in a way — 2013-12-26
• Company with a 2004 I.P.O. — 2012-09-30
• Owner of YouTube — 2012-04-22
• Modern means of search — 2005-09-27
• Much-used engine — 2005-09-11