The REST API docs state that the maximum length of the "text" parameter to /direct_messages/new.format is 140 characters.
Testing that interface shows that 255 characters go through without any problem. Also, this message from Alex indicates that it's an allowable value: <http://groups.google.com/group/twitter-development-talk/msg/ f7a2e84d5e40313b?hl=en> Won't this present a problem for users who are getting their direct messages through SMS? Do they get truncated on delivery? -ch
