How to use steganography to put secret messages in your tweets

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 yo 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.