Police received a request from a member of the public to look into several internet posts written by Finns Party Youth chair Sebastian Tynkkynen.
The complainant claimed that Tynkkynen had spread false and hateful attitudes against Muslims in Finland.
According to Oulu Detective Chief Tapani Tasanto, the complaint included about a dozen pages of Tynkkynen's posts.
"The person who submitted the inquiry request had copied the texts and printed them out," Tasanto said. "It seems that the texts, at least to a certain extent, were Facebook posts."
Tasanto said the complaint claimed that Tynkkynen's writings were not only racist, discriminating and baseless but also "clearly aimed at certain ethnic groups."
Last month the youth politician called for all Muslims without Finnish citizenship to be deported to their countries of origin. Police say they received the complaint arrived in late July.
According to Tasanto the prosecutor's office is not yet involved in the case and the preliminary investigation is just beginning.
