In response to the comment sent in by reader Emily Ryall regarding text message communication:
Pragmatically, text messages are not incomplete conversations. Emily's suggestion that there is "a tacit acknowledgement that the sender doesn't really expect a response (to every message)" is right on. Text messaging should be thought of as its own context and different contexts have different norms. The norms of text messaging are not the same as those of face-to-face conversations. Additionally, as long as the expectations of both speaker and listener (in this case sender and receiver) are met, the communication should be considered a pragmatic success.