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    <p>Speaking generally, I think you should do both. Any private data you collect is simply a liability for you, and not just because you intend to publish your databases. The less you can collect, the better.</p> <p>By the same token, however, you probably realize that it is not just IDs and passwords which are sensitive. Remember <a href="http://en.wikipedia.org/wiki/AOL_search_data_scandal" rel="nofollow noreferrer">the AOL search data leak</a>? Or the Netflix database publication? Even without having IDs, <a href="http://www.securityfocus.com/news/11497" rel="nofollow noreferrer" title="Researchers reverse Netflix anonymization">people managed to figure out the real identities</a> of some of the accounts, simply by piecing together trails of user behavior, and corresponding that with data from other places. Some people are embarrassed by their search histories and their movie rentals. Go figure.</p> <p>Therefore, I think the general rule should be to collect as little as possible, and anonymize what is left. Even if you don't store the identity of the person corresponding to a certain account, you may want to scramble what the various logins did.</p> <p>On the other hand, there some cases where you simply don't care about this kind of privacy. In Wikipedia, for example, pretty much everything you can do on the site is public anyway. At least, everything which gets recorded in the database. If the information is already available through the API, there is no point in hiding it in a database download.</p>
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