Meow Hash v0.2 will be arriving shortly. It is now the fastest hash on anything over 32 bytes, so for data hashing you can now pretty much just fire and forget:pic.twitter.com/EHTfv239jA
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Incidentally, CRC refers to a specific kind of digest (polynomial remainder in a field of characteristic 2) and is designed for detecting single-bit or burst errors e.g. communicating over a noisy channel. It's not for this use case.
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