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Re:Ask HN: How would you turn Twitter around? by kalleboo on Wednesday March 01, 2017 @04:41AM (#13762533)
140 bytes to be more precise. An SMS client will cycle through 7-bit, 8-bit and UCS-2 encodings depending on the content, limiting the number of actual characters depending on the language.

The last time I tested it aaages ago, Twitter didn't enforce the encoding-based limitations, and if you sent a 140 character tweet full of unicode, it would actually send you several concatenated SMS.

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