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Justice Minister Katarina Barley and Germany's digital coordinator, Dorothea Baer, also called on Monday for tougher social media controls following the data breach, which began in December but initially went largely unnoticed.
"Such an attack must be used as a reason to very carefully examine if everything has been done to achieve the best possible security of data," Baer told the Handelsblatt newspaper.
"It is legitimate to examine whether software manufacturers and platforms must be required to do more to ensure data security," she told the paper, without providing any details.
Robert Habeck, leader of the Greens, said he had cancelled his Twitter account after he spoke disparagingly about the eastern German state of Thuringia in a video tweet. He said the medium caused him to be "more aggressive" than he would otherwise be.
Habeck said he was also deleting his Facebook account because it was the main tool used to spread private data published as a result of the breach, including chats with his family members.
No comment was immediately available from Twitter. Facebook declined to comment on the data breach issue.
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