What are the top websites today? Facebook, Google, Youtube, Wikipedia, ect. What are examples of the up and coming websites? Pininterest? Reddit?

All of these websites are media based. These websites focus on the content that they provide. None of these services, with the exception of perhaps Google, really care about software development. All of them care about their sites content.

Because all of these websites are media based, their business models revolve around ads and click counts.