Why are Tweets limited to 140 characters?

Answer

jluppino
Vote Up (19)

It's because of the 160 character SMS limit.  140 was chosen to give you room to include a user address along with the message.  So 140 for the message + 20 for the user address = 160.  It's the Kevin Bacon effect of SMS.  As for why SMS has a 160 character limit, I have no idea.  

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