It should pattern with other discourse markers if it is predominantly employed as a discourse marker (e.g., a hedge). I examined into how it was used in the Switchboard corpus (Godfrey and Holliman, 1993). A subset of one million words from the corpus was also annotated for a variety of attributes, including part-of-speech. From this corpus, I determined that although it does occur with other discourse markers, it is most commonly found at the beginning of a sentence or clause. In conclusion, while there are instances where it is used to mark a discourse unit, mainly it is used as a form of punctuation.