The whole "140 is based on an SMS length" thing was weird IMO, given that SMS can also be 70 or 160 chars, depending on the char set.
@usr_local_share was there a time in which you could post to Twitter from an SMS? I've never seen that in Brazil (I never get to know what exactly was the character limit of an SMS here also).
I which that functionality was in place.
@fiatjaf IIRC that functionality is still there, except not advertised.
That's why, for example, users reported problems starting tweets with the word "M" (e.g. "M. Night Shyamalan"), because "M" is the command for sending a direct message and, in that specific example, http://twitter.com/night is a suspended account.
The original server operated by the Mastodon gGmbH non-profit