Google has published its annual report on search spam revealing SpamBrain, a machine learning-based spam identification system, took action on six times as many spam sites in 2021 as it did in 2020. By identifying these sites, Google claims a 70% reduction in hacked spam and a 75% reduction in gibberish spam on hosted platforms. By recognizing sites with disruptive or malicious behavior, Google was able to keep 99% of searches spam-free.