---- 17 May 2013 - GWT Sudden Surge in Crawl Errors for Pages Removed 2 Years Ago?
indyank - 2:58 am on May 29, 2013 (gmt 0)
AFAIK. there is definitely a relationship between Panda and increase in crawl errors for negatively impacted sites. But I am not sure on the relationship between increase in crawl errors and other algorithmic changes.