I’m a huge believer in getting a million people, getting them engaged, and then building a business model on top of that. I knew I wasn’t planning on really trying to work on a business model until later.

Reid Hoffman – LinkedIn’s startup story: Connecting the business world – Jun. 2, 2009

I’ve never met Reid. My guess is that he had a bunch of ideas about business model possibilities for LinkedIn but didn’t obsess on those until he had a product that scaled and mattered to users.