MySpace offers a lot of options for personalizing your page, but to the point where it became cluttered, flashy, and immature.
Facebook offers applications and games. At one point, they had separate pages for users - on for information and one for applications and boxes (think "What Disney character are you?" quizzes). Facebook, too, becomes easily cluttered.
Twitter offers personalization for one solid background with a set layout for everything else.
Google+ has very little style personalization and a lot of informational personalization right now.
Who has the right idea? How much should a customer be allowed to personalize their options?
