Facebook logs and saves a lot of data about you and what you do on their site. This shouldn't be surprising given the more time people spend on Facebook, the greater the cash flow, but just how much data do they store? Austrian law student Max Schrems, because European law states that citizens can do this, requested all the data Facebook had about him. He got back a CD with 1,222 PDF files.
There was his log ins (above). There was message activity:
And geolocation for pics from his trip to Vienna:
But again, it's not surprising. People use Facebook, a free service, to upload pictures, update statuses, and share links with their own free will. It's more surprising that people are surprised by this — or that Facebook used a CD to transfer Schrems' data.