Why can Sina Weibo only post (or comment) 140 words at a time?

Because an English short message can transmit at most 160 bytes, Twitter has reduced it by 20 to 140 bytes in order to leave system characters (such as "/@"). ) and ID. The letter 1 English is exactly 1 byte, so Twitter limits the number of words in a tweet to 140 words (English words), otherwise tweets exceeding 140 words will be presented on the screen in the form of two relatively incomplete messages, which will bring users a bad experience. This is for the user experience.

Because the website is responsible for the user's short message uplink cost, if 1 pushes more than 140 bytes, the website will bear the cost of more than 2 short messages, which will increase the operating cost of the website, so it needs to be limited to 140 characters. This is for business reasons.

Weibo of China copied Twitter, so he also adopted the restriction of 140. 1 Chinese short message can only transmit 140 characters, but 1 Chinese character is 2 bytes, and 140 characters correspond to 70 Chinese characters. So, if you use your mobile phone to write Weibo, when there are more than 70 Chinese characters, you have to pay two short messages. China's Weibo website, Fanbu, was the first to bear the cost of SMS uplink, that is, users used their mobile phones to send Weibo, and Fanbu paid the bill. But Sina Weibo wants you to pay the SMS fee yourself.