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Metadata is information generated as you use technology, and its use has been the subject of controversy since NSA’s secret surveillance program was revealed. Examples include the date and time you called somebody or the location from which you last accessed your email. Explore some of the data collected through activities you do every day. Today The Guardian’s data editor James Ball will answer your questions about the NSA data collection program in the US from 3pm-4pm EST | 8pm-9pm BST