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The definition of open knowledge is still a subject of debate. At this time, I avoid web services that disallow bulk access to data created collaboratively by their users. An examples of such badly behaved site is IMDB and Flickr: both have been created with data provided by users, but access to this data is only possible through the service, and bulk downloading is not allowed. On the other end of the spectrum, Wikipedia provides an interface to dump the entire database, including the edit history. This is what we should demand from any online resource built collaboratively.
When choosing where to host your data, take into account this important freedom.