Will the phone be blacklisted when it rings?
The word blacklist comes from world-renowned universities such as Oxford and Cambridge in Britain. In the early Middle Ages, these schools stipulated that the names and behaviors of students who committed bad behaviors should be recorded in black books. Whoever is named in the black book, even if it is not notorious for life, will make people lose their reputation for a long time. Students are very afraid of this regulation of the school, and they often take care to prevent deviant behavior.
This method was borrowed by a British businessman at that time to punish customers who often failed to repay loans, keep contracts and break promises.
British businessmen listed the names of such customers on the black book, and later listed some names that were bankrupt and about to go bankrupt on the black book. After the news spread, it caused a sensation in society. First, businessmen rushed to follow suit. Then, black books appeared in all walks of life. Many factory owners listed the names of people who joined the union under the column of "no employment" As a result, the blacklist was secretly passed around between factory owners and shop owners.
1950 In September, the US Congress passed the Macaron Act. In February of the same year, President Truman issued an order announcing that the United States entered a "state of emergency" and formally implemented the McCullough Act. They compiled various blacklists and arrested a large number of tyrants by name. As a result, the practice of blacklisting has been revised.
Now in the optimization of network SEO, we can use the list of search engine spammers collected by search engines or voluntary users to prohibit these spammers from entering search engines or boycott them.