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One user of Facebook managed to collect and seed on the torrent networks over 100 million users' public data; data that is available for 'everyone' to view. This caused outrage towards Facebook, with many realising the scope and breadth of how much of one's personal data is made accessible by the site.
Arguably, though the data was seeded to torrents, the data was available to see on Facebook without a username and password to even access the site. But it caused enough of a stir for Facebook to readjust its privacy settings.