The author thinks that it was just "PR and faffery", while discounting the actual value of PR and faffery. Never discount these things. MySpace was practically built on it.
Plus Zuckerberg's massive anti-privacy bias caused him to push the product in the right (superior product/market fit) direction in the face of significant user complaints (i.e. beacon).
And the speed at which facebook has been able to re-invent itself multiple times (e.g. platformization and twitterization) has been very impressive.