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Those involved in the production or dissemination of the materials can be charged with violating the country's anti-pornography as well as Information and Electronic Transaction laws, he added.
But the experts will first have to prove whether the materials and exchanges are fake or real," Senior Commissioner Argo said.
The case is the latest in a string of accusations lodged to the police against the chairman of hardline group Islamic Defenders' Front (FPI), from blasphemy to hate speech to insulting state symbols.
Mr Rizieq had been jailed twice previously - in 2003 for inciting his followers to violently harass people at nightspots in Jakarta, and in 2008 for attacking a minority group holding a vigil in the capital.
He rose to prominence in recent times after leading the FPI in three mass rallies between October and December last year, to protest against Jakarta Governor Basuki Tjahaja Purnama, popularly known as Ahok, for allegedly insulting Islam.
Dating website-cum-application Ayo Poligami (Let’s do Polygamy) previously caught netizens’ attention because of its polygamy-related nature.