Google had a special logo up on September 27, 2009 to celebrate their eleventh birthday. Here is the logo, which is available on Google properties.
Google’s birthday has moved around to various dates in September.
Google The 12 Year Old
January 1996
This is when Google cofounders Larry Page and Sergey Brin started working on BackRub, what later become Google. Use this month, and Google is 12 years old.
Google The 10 Year Old
Sept. 15, 1997
This is when, as the AFP reports, Google registered google.com.
Google The 9 Year Old
Sept. 7, 1998
This is when Google may have officially incorporated.
Google The 9 Year Old
Sept. 27, 1998 (Current Official Date)
Back in 2005, Google declared that Sept. 27 was its birthday. But wait — what happened with that Sept. 7 date? Well, in 2005, Yahoo came along and freaked Google out by announcing an index that was larger than Google’s. It had been ages since anyone did that. Quite a debate ensued, and I did a long write-up about it then.
Things got resolved by Google doing some PR. They announced that for their “birthday,” they’d gotten bigger — but were also dropping the count of pages from the home page, which helped (thankfully) defuse the size wars that often meant nothing about search quality.
Courtesy of Barry Schwartz, News Editor, Search Engine Lande