Last week, Google launched an algorithmic change tend to rank sites with original content scraper so low. The net effect is that researchers are more likely to see the sites that wrote the original content. An example would be stackoverflow.com tend to rank higher than sites that just stackoverflow.com reuse the content. Note that the algorithm change is not specific to stackoverflow.com well.

It was a very specific launch just over 2% of change requests in a certain way, but less than half of one percent of search results enough to change anyone if really noticing. The net effect is that researchers are more likely to see the sites that wrote the original content rather than a site that scraped or copy content from the original site.