Ok very interesting. Someone could theoretically send messages to another person that is readable by a human but unsearchable by Twitter search.
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If you use unicode and select a different character set like gothic, you can't find it with a normal search even if you search the words in the tweet. You would probably have to search the exact same character set. This could allow people to send public messages that can't get
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Lol why stop at fancy unicode. Use ODF and you can change the whole font mapping 😯
github.com/thoppe/PDF_ste
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Plain Twitter and just copy / paste the unicode.