Rule Based Writing: Related to the above is the idea that when you change the rules (context) around any written communication you necessarily change the content of such an utterance. Rules rather than hindering communication can actually be really productive (for the long version of this argument read about Oulipo). Because Twitter is based on SMS technology it limits communication to 140 characters, it is surprising what develops out of this limit, and how quickly one starts to think in messages of 140 characters.