CMC research presents emoticons as visual representations of writers' emotions. We argue that the emoticons in authentic workplace e-mails do not primarily indicate writers' emotions. Rather, they provide information about how an utterance is supposed to be interpreted. We show that emoticons function as contextualization cues, which serve to organize interpersonal relations in written interaction. They serve 3 communicative functions. First, when following signatures, emoticons function as markers of a positive attitude. Second, when following utterances that are intended to be interpreted as humorous, they are joke/irony markers. Third, they are hedges: when following expressive speech acts (such as thanks, greetings, etc.) they function as strengtheners and when following directives (such as requests, corrections, etc.) they function as softeners.