"So a lot of people like to see what their friends are doing and play games that challenge the average sheep's IQ, but what does facebook do that is world chang

"So a lot of people like to see what their friends are doing and play games that challenge the average sheep's IQ, but what does facebook do that is world changing" Basically, you just implied what Facebook has done - redefine how we build and maintain relationships. That's a huge social impact. Now that every single damn website has "Login with Facebook Account" button, I think it's a big deal. Now that every phone comes out with "syncing with Facebook" feature, I think it's a big deal. Now that people actually put their credit card info and buy stuffs on Facebook (although it's small right now), I think it's a big deal. Now that there is a single entity that keeps track of our life/relationship history, I think it's a big deal. I mean... these are probably not a big deal for you, but many people in the tech industry think so. That is why the valuation of Facebook is so high. It has a lot of potential. It's not all about just.. attracting people to increase traffic and spamming them with ads. It's more about how the social aspect of everyone's lives have been redefined. There was letters, then phone, then emails, then now.. facebook/twitter/etc. Plus, Lars cannot give Wave "another try" at Facebook. Google Wave is a Google's property and anything related to Wave technology will make a good reason for Google to sue Facebook -- just to worsen the relationship of the two companies. Facebook probably wanted the leader who excels are putting out great products. That's what Lars is great at.