On June, 2017, the number of monthly users exceeded 2 billion people, and Facebook became the world’s largest influential SNS, analyzing big data that recorded the user’s actions in the service Data mining is performed to extract data that can be used in fields such as advertisements. In the past, Facebook in particular gained the ability to surpass people’s “knowing power”, such as Facebook knew that a user is gay before family , especially on Facebook, publicly announcing that it is a Jewish It has become clear that we were sending religious related messages to users who were not.

Jewish Calendar New Year In the evening of 20th September 2017 which is ” Roche Hashaner “, some users who logged in on Facebook celebrated the New Year “Happy New Year! All of us at Facebook wish you a sweet and happy new year.” (Happy New Year. A message that Facebook is a celebration of New Year) was displayed. Many of the people who received the message were Jewish people, but it is calling people ‘s speculation that some people did not reveal themselves as Jews.

A software programmer living in Illinois, USA, Mauricio Sadikov, received similar messages from Facebook. But Mr. Sadikov did not mention confidence in Jew ‘s profile, such as Facebook profile. In response to this, Sadikov is posting on Twitter “I feel uncomfortable in many ways … … I have not mentioned about religion in my profile, but Facebook sent a Jewish New Year celebration” It is.

As the sole reminder, Mr. Sadikov mentioned what he posted about Huanukar , a Jewish festival a few years ago , “I guess this is probably the cause?”

For Facebook and other SNS and Google’s Gmail, etc., users can analyze contents posted by users, contents of e-mail, etc. on their computers, and track user’s tastes by tracking actions and access history in the site I’m classifying it. The data obtained in this way is used for the purpose of displaying advertisements which are efficiently appealed by the user’s interest, but this means that “Facebook wants to know what he wants The category of information that Facebook is gathering is from categories like “Millennial generation” to “from friends living overseas” and “away from family” “I lived there” and “It came back from a trip a week ago” and so on.

On Facebook, we are disclosing what kind of data we are using about advertisements, and the details on how advertisers are approaching the target audience are described on the following pages.

About Facebook Advertisement 
https://www.facebook.com/ads/about/?entry_product=ad_preferences

For Facebook, “Facebook sends a message based on a religious schedule to users living in a country where a particular religion is a majority, or living in a country where religious anniversaries are on holidays I am also sending a message to those who showed interest on that holiday. “The message that Sadikov’s idea of” Posting about Hanukkah “was sent It is inferred that it became. A media professor at the University of Virginia Schwebaideidhanasan points out that the message sent by Facebook about Roche Haschner is a “new example showing how much Facebook is tracking us.”

It is unclear whether Facebook is the first time Facebook sent a message on Roche / Hashaner, and Facebook does not answer CNN’s interview. Professor Bernard Harcourt of Columbia University points out the possibility that this Facebook message is “a test to confirm the accuracy of the algorithm”. This means that Facebook tracks that the user responds to the message “I am not a Jew, but thank you” or “How did you know that Facebook is a Jewish?” To determine the accuracy of the “Jewish decision algorithm”. Although it is a theory that goes beyond guessing to the last, Mr. Harcourt points out that “When improving advertisements for Jews, algorithms improved by this series of tests may be useful.”