[apalmblad]

I feel like the author is overstating the benefits of a like button on every page. Google - and many other ad networks - also know the products being viewed if the site owner is using retargetted ads. Might facebook offer compelling retargetting? Sure. But I imagine the conversion rates would be, at best, comparable to other retargetting networks. Probably not a game changer.

I'm not even mentioning the reach of analytics.