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How to hide secret messages in your Twitter updates
Twitter offers a surprising freedom of expression within 140 characters, but what if you want to hide a message in plain sight -- say, to get around censorship? Well, it's now as easy as pie. Matthew Holloway has built a web tool that uses steganography (that is, hiding messages within other content) to put secret phrases inside your tweets. The technique replaces letters with similar-looking characters that hide a second message you can only reveal with the right decoder.
