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Two weeks after saying hackers had accessed the personal information of around 50 million Facebook users, the social network said that, actually, the victims were around 30 million people.

But the data the hackers accessed, it appears, was more sensitive than initially thought. Some of the data stolen included check-in locations and the users’ previous 15 searches on the site.

In a blog post published Friday, Facebook said that “of the 50 million people whose access tokens we believed were affected, about 30 million actually had their tokens stolen.” Of those 30 million, Facebook said it identified four groups

This post first appeared on motherboard security news. Read the full article.