A Good Review of Google?s Jagger Update
This is a lengthy article. But it’s comprehensive and thorough. If you have noticed a marked drop in Google traffic in the last month, I strongly suggest reviewing this article.
The Jagger Update was introduced for three main reasons. The first was to deal with manipulative link-network schemes, sites generated with scraped content and other forms of SE-Spam. The second was to allow and account for the inclusion a greater number of spiderable documents and file types. The third was to allow and account for new methods of site acquisition beyond the use of the spider Googlebot.