Last fall, Kanye West, a zealous user of Twitter, coined the phrase “hashtag rap” to describe analogies in rap lyrics that use a comic pause where the words “like” or “as” might be expected. West explained that this style conveys the rhythm of the pound-sign in online hashtags. Consider lines from the rapper Drake like, “Two thumbs up [PAUSE] Ebert and Roeper” and “I could teach you how to speak my language [PAUSE] Rosetta Stone.” Hashtags have become a big part of the rhythm of online communication — on the social networks, but even in e-mail and texts. Leave it to West and Drake to formalize them as prosody.