"The harrowing events unfold through emails, text messages, web pages, Twitter feeds, and instant messaging--the natural modernization of Bram Stoker's original Dracula, which was written in letters, diary entries, and news clippings." --Goodreads description 
 So, I actually kind of liked this. It's super-fast to read, and fun to piece together the plot based only on electronic communication (including a very suspenseful use of "delivery of your message has been delayed"!). I wonder how soon the texting interface will change, making this book a relic. The author dedicates it to her son, her husband, and her cell phone.