Google: We Only Rewrite A Low Number Of Page Titles But If We Are...

Gary Illyes from Google was quoted as saying "We rewrite page titles in a low number of cases." Jennifer Slegg also loosely quoted him as saying "if Google is rewriting your titles, that is a sign you should work on rewriting those titles." This is from a conference named UnGagged where supposedly you are not allowed to share what you learn - but yet here we have a share.