Did you know that Facebook in many Asian countries allows users to include their blood type in their profile?
That is because there is a popular belief in Japan and other Asian countries that a person’s ABO blood type is predictive of his or her personality, temperament, and compatibility with others, similar to how astrological signs are used.
Discussion of blood types is widely popular in women’s magazines as a way of gauging relationship compatibility with a potential or current partner.
Morning television shows feature blood type horoscopes, and similar horoscopes are published daily in newspapers. On Japanese Wikipedia, blood type is among the first attributes listed in the infoboxes for celebrities, frequently between birthdate and birthplace.
A series of four books that describe people’s character by blood type ranked third, fourth, fifth and ninth on a list of best selling books in Japan in 2008 compiled by Tohan Corporation.