I picked this up to review with low expectations - there are lots of business-y books out there promising to give you some magical formula for incredible website growth, so I opened it up with skeptical eyeballs. The first chapter was a rip-roaring account of the founding of Hot or Not, a website I remember spreading virally in popularity across my university campus in the late 90's. As an end user I remember me and some of my psychology undergrad classmates clicking through for hours and arguing about the evolutionary psychology underlying people's scores (this was waaay before Facebook and the like). Behind the scenes though were a couple of bright young kids running around like crazy trying to ensure they had the bandwidth and the servers to keep hosting the site, and PR buzz that you couldn't possibly dream of as the site exploded and joined the mass consciousness. Those guys are now comfortably rich and the concept has been exported into numerous widgets and social media sites, but its a great opening chapter to a fast-paced and well researched book exploring the history of several similar ventures, both successful and dot-bombs, including MySpace, Facebook, Friendster, and Hotmail.
As I now work at an online company (PatientsLikeMe) there were a lot of useful take-home points that made me see our own marketing and customer acquisition process in a slightly different way. I'm no marketer by the way, so maybe some of this stuff would be more obvious to people with that background, but I liked the historical comparison of word-of-mouth marketing moving from Tupperware parties through to embedded invitations. For many sites the "Virality" of their target audience is clearly important but it's not universally applicable and the last few years have seen virality bump up against privacy concerns. Facebook's Beacon program is a prime example where monetizing the viral network can cause a backlash, and companies with unethical user acquisition strategies are coming under increasing fire.
Adam Penenberg writes well in a lively and accessible manner and I will be on the look out for other work from this author.