On the 2nd of May, Google posted their annual webspam report for 2015 on the webmaster blog. From the report we can see that they made 4.3 million manual actions during the year or to put it another way – Google does 500 manual penalties per hour.
After this information we ask ourselves: Why so many manual actions are needed? From the report we read that Google detected an increase in hacked sites of up to 180%. To reduce these sites from showing up in the index Google used both manual actions and specific hacked sites algorithm. Google also reported that they:
Saw an increase in the number of sites with thin, low quality content. Such content contains little or no added value and is often scraped from other sites.
More than 4.3 million warning messages have been sent from Google to webmasters for notification of the upcoming manual actions. There was still a 33% increase in efforts to clean up spam which is definitely a good number of reconsideration actions. Other shared data includes the total number of spam reports. More than 400,000 spam reports have been received and Google acted on 65% of them. From the whole number 80% were really considered spam, so we can say anti-spam measures are really taken care of.