My personal opinion - I would not read the world's longest poem on twitter, but i would read literature broken up into 140 characters. The reason for this is it would be easier to consume tweets of 140 characters at a time while taking notes in between rather than a poem that is really long. A poem that goes on forever would make me loose interest, and make it hard for me to comprehend. Overall I believe the world's longest poem should be broken up into tweets of 140 characters.