A Non-Anonymous Internet: What are the pros and cons?

How would the Internet change if there was no anonymity? How would your participation change? Would your outlook on the Internet as a whole change?

For the sake of this discussion, let’s assume that there is some central group responsible for the account creation and real life verification, and third party websites (let’s assume a Facebook, a Fluther, a YouTube, and a celebrity gossip website, amongst others) would only allow such verified accounts to participate. With one click, any similarly logged in user would be able to find your first and last names, your state and country, and your email address. Also assume, for the sake of this discussion, that your personal details would never be leaked (example: a verified user couldn’t make an external website listing off people’s names and email addresses).