Launched in the spring of 2012 algorithm (filter), which is intended to clean extradition Google from websites, abusing the unnatural formation of the external reference profile. Suspicious sites run the risk of this filter:
- having many backlinks with non-thematic resources;
- not disdainable accommodation links on donors low quality and authority;
- using services exchange for the purchase / sale of links (especially when it comes to Sape and like her);
- building reference mass irregularly, which leads to the emergence of so-called “leaps”, to which search engines respond with lightning speed;
- in the reference profile of which the weight fraction is temporary links, which have the property of “flashing” (disappear) in case of non-payment of their placement;
- participating in systems link exchange (linquators or link exchanges).