As for why most of the world uses PC's and Windows, Daddy, there is only one answer-- Business.
Corporations use it, and so the world follows blindly, without thinking twice, despite the fact that everything is done-- from my perspective anyway-- ass-backwards and takes twice as long. Sure, there was a time when things like creating spreadsheets on Excel and other business apps were developed for and worked somewhat better in Windows, but of course that time has long passed. Many people either don't own their own computers, or got their intro to them through the workplace, and so are stuck.
As far as MySpace, that's sooo last year Daddy. And if you think that's rotten, try Friendster. Still, I have re-connected with a great many lost contacts through MySpace, so there's something to be said for it, I guess. But I agree, it is developed for PC/Windows users wanking on their office or school computers when they were supposed to be working. Certainly, almost none of the music or videos people post were actually created on that clunky platform.
AOL, now that's another story. I have to laugh at those who use it. However, it's obvious what people like about it most-- those endless chatrooms. Never mind that it kills any possibility of learning how to utilize the internet properly and efficiently. People, I guess, feel "safer" within AOL's "village." Though, that safety, as is continually proven, is totally illusory. Bah!
But just the thought of using a "fake" iTunes, a PC clone of Photoshop, an imitation music writing program boggles my mind. I mean, why bother?