Neither online sales nor ebooks were original to Amazon, but Amazon has had a lot of success selling their brand to the public and have gained mindshare that in a way is even more important than their market share.

Amazon’s user base makes it a default social media site, smaller than Facebook or Twitter but more important because every Amazon account has a real name, address, and credit card attached — and that’s even before we consider Amazon also knows every shopper’s browsing and buying history.

–Rocket Bomber collects a big ol’ page o’ quotes about Amazon.