A SECRET WEAPON FOR FRANK SINATRA SEO

The URL is returning a "not identified" mistake (4XX) or server error (5XX) – This might be accidental (the page was moved along with a 301 redirect wasn't build) or intentional (the page was deleted and 404ed in order to get it faraway from the index) If a website suffers a drop in rankings for particular keywords, then that is a signal to SEOs