Building large data sets doesn't necessarily mean from personal data. Look at open-data initiatives such as http://open.canada.ca/en/open-data http://open.cana

Building large data sets doesn't necessarily mean from personal data. Look at open-data initiatives such as http://open.canada.ca/en/open-data http://open.canada.ca/en/open-data . Lots of potential for useful tools to be created if the data is there, which won't happen if even benign data like that are kept under wraps/not collected.