The Difference Between WordPress and Facebook
Is about $14.8bn according to the publicly available information about the most recent financings of the two companies ($15bn for Facebook and $200mm for Automattic).
But consider this comscore chart of unique visitors over the past year.
It’s a very similar growth trajectory, driven largely by the same phenomenon – the creation of personal spaces on the web by people who want to engage with others.
So why is Facebook worth $15bn and WordPress is worth $200mm? Well for one, Facebook controls the advertising inventory on the pages it serves and WordPress does not. And for another, Facebook has built a "soup to nuts" social network with powerful viral channels (which they are cutting back on) and WordPress has not.
But trust me on this one. The blogging revolution is the adult social network whereas Facebook style social networking is for teens and college kids. This gap will narrow.