“About 7.3 billion text messages are sent within the United States every month, up from 2.9 billion a month a year ago. Compared with an ink-and-paper letter, messages may seem disposable. The relative inconvenience of typing out words using a numeric keypad — the letter “c,” for example, requires three presses of the “2” button — and the brevity of the message may seem a hostile environment for heartfelt discussion. But the discipline of having to distill thoughts into short bulletins, then waiting to receive the response, allows users to pour more meaning into the writing, some text-message users say.”