This is an excellent landing page for a technical book. I haven't seen this style before, but the code snippet and details for each chapter gave me a good idea not just of the book's content, but of its emphasis and assumptions.

It suggested that this was a book about solving practical problems (e.g. all the bullet points about file formats, integration points like databases/Twitter/IRC, visualisation), assuming some Haskell knowledge (little time spent on Haskell concepts) but little machine learning knowledge (bullets showed elementary topics like MD5 alongside more advanced topics like perceptual hashing).

Based on this landing page, I bought the book; I probably would not have done so based only on the title and a synopsis.