Google's Matt Cutts announced that the on-page spam detection algorithm is indeed live now. Matt said, "one change that primarily affects sites that copy others' content and sites with low levels of original content." That change was "approved at our weekly quality launch meeting last Thursday and launched earlier this week."
Who does this impact? Cutts explained:
This was a pretty targeted launch: slightly over 2% of queries change in some way, but less than half a percent of search results change enough that someone might really notice. The net effect is that searchers are more likely to see the sites that wrote the original content rather than a site that scraped or copied the original site's content.
On Hacker News, Cutts wrote:
"The net effect is that searchers are more likely to see the sites that wrote the original content. An example would be that stackoverflow.com will tend to rank higher than sites that just reuse stackoverflow.com's content. Note that the algorithmic change isn't specific to stackoverflow.com though."
As a result at Webmaster World, there is discussion about big drops in traffic.
[tags]search results,web search,internet search,algorithm,content span,scraper,scraped contents,search engine ranking,pagerank[/tags]