In early October 2012, Google lived up to Matt Cutts’ promise of “jarring” updates. In about a week Google pushed out the exact match domain (EMD) update, a new Panda update, a page layout algorithm update AND the long awaited Penguin refresh. The EMD update happened first, and plenty of sites without keyword rich domains claimed they were unfairly nailed with a search engine penalty. A few days later it came to light that all these other updates went live around the same time (SEO Roundtable has this great graph breaking it down) and site owners where left scratching their heads—which algorithm update caused my search engine penalty?