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【Update: Do not know when it happened but Twitter no longer differentiates between BMP and non BMP characters WRT character count. All characters now have a count of 1. I may, at some stage, delete this article but, for the time being, I will leave it here as an historical record of the evolution of Twitter. 】 In a previous article I examined  Sina Wēibó 新浪微博 character count for a user post  schappo.blogspot.co.uk/2012/10/weibo-character-count.html  Lets now examine twitter. The stated and generally understood limit is 140 characters for a tweet. This is not strictly true. The actual tweet limit is variable and ranges from 70 to 140, inclusive. Different characters have different counts, as follows: Characters from Unicode range U+0000➜U+FFFF have a count of 1 Characters from Unicode range ≥ U+010000 have a count of 2 Or, to put it another way — Characters in the Basic Multilingual Plane (BMP) have a count of 1 and characters in the other planes have a count of 2. The 2 ...

Same as all the other microblog systems I have encountered, Sina Wēibó 新浪微博 has a 140 character limit for a user post. This is not strictly accurate. The character limit is variable and ranges from 70 to 280, inclusive. It depends on which characters are included. Different characters have different counts, as follows: Characters from Unicode range U+0000➜U+00FF have a count of 0.5 Characters from Unicode range U+0100➜U+FFFF have a count of 1 Characters from Unicode range ≥ U+010000 have a count of 2 Some of the consequences of these differing counts are: If one writes in everyday English then one has up to 280 characters as these will be Latin characters in Unicode blocks Basic Latin and Latin-1 Supplement  U+0000➜U+00FF. The Latin Script does though occur in several Unicode blocks en.wikipedia.org/wiki/Latin_characters_in_Unicode . Latin characters in Unicode blocks other than  Basic Latin  and  Latin-1 Supplement  will have counts of 1 or 2 and usage of them...