What new features and functionality would you want to see in Facebook and why? How could these new features help Facebook earn revenue?

I, personally spend a consider amount of  hours each day on Facebook. One of the additional function I want Facebook to have is an Email service. That would definitely help Facebook expand their business model to directly compete with Yahoo mail and Gmail, since Facebook already had a massive community of follower; their chance of winning the battle is very high. This could also  helps Facebook increase their revenue, since companies can use this as an additional channel to communicate with their customers.