BERLIN, April 5 (Xinhua) -- German justice minister Katarina Barley on Thursday publicly attacked U.S. social media giant Facebook in the ongoing Cambridge Analytical data scandal.

Speaking to press in Berlin, she labeled Facebook as a "network of opacity" and demanded consequences for the firm in response to its mishandling of private user data. "The time has come for a serious reaction by European states," Barley said.

She consequently called for "clear and legally-binding regulatory requirements on the operators of social networks on the European level" and demanded that Facebook should reveal its internal algorithms to public authorities.

Facebook has recently admitted that the data of up to 87 million users was passed on illegally to the election strategy company Cambridge Analytica. Previously the social network had put the figure lower at around 50 million affected users.

According to Facebook, up to 310,000 Germans are likely to have been affected by the scandal. Barely criticized on Thursday that the incident highlighted how "ethical principles fell victim to commercial interests" at the company founded by chief executive officer (CEO) Mark Zuckerberg.

The justice minister argued that the only way for Facebook to regain lost trust was to allow independent experts and data protection agencies to subject the company's practices to a thorough investigation.

"The state must be able to fulfill its protective and ordering roles in the internet as well," Barley told press.

She went on to demand that a review of Facebook's business model could not just be limited to its dealings with Cambridge Analytica but would have to encompass all of its commercial activities.

"We must clarify whether other application operators have engaged in large-scale abuse of user- and contact data," she added.