Faust 2.0 by Michael Brookes

This is the story of an evil entity coming into being and taking over the internet.   This being likes to work its way into vulnerable people's lives by promising them what they want in return for "just one favour"

This story is a mix of high tech and creepiness.   I could imagine this being played out on the screen as the descriptions of the characters and scenes were very well written.  I enjoyed this book very much indeed.

http://www.amazon.co.uk/dp/B00CTA3YIE/?tag=jookuf-21