Facebook, Twitter). Like women's fashion, some marketing documents are trendy for awhile, then considered unhip.only to emerge again a few years later in a new form. So it is with e-books, the latest incarnation of short-book projects such as technology primers and guides that I wrote for clients in the 1990s.  . book Advantages. Deli.cio.us) and microblogging sites (e.g., Book Drawbacks.