A big thing that keeps me from enjoying Flickr more is the inability to find duplicate files. The API doesn't support any sort of checksum, so for years people have tried to get around it by adding 'machine tags' of the form checksum:md5=1ed002a1483f4ae019470e3c3ffbfc7e. This sort of works, but there's no telling how long the tag search index takes to update — so if you upload a new file, it may or may not appear in search results for days, so any search for it will fail.
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