As my personal opinions: 3. is not a good idea. It's been tried in the past several times and it always eventually fails. People want "the real website", not a slimmed down version. And then, nobody wants to develop and maintain two versions of a huge website. Of course this is not black and white. A good web site detects the browser that is being used and perhaps configures its offerings (UI etc.) to better suit that target device. But "own websites" - I don't think so. Perhaps iPhone will prove me long in the short term, but I think the Internet will prove the iPhone wrong in the long term. People want to access the real sites with the real content. Devices come and go, it is really unfeasible for developers to create custom versions for any device. Perhaps if one device would have 50% of market share, but otherwise not. 2. What would actually be a Facebook application? If not the Facebook site itself? (If not considering now the applications inside Facebook...) Or what would be a Myspace app? And wouldn't it be obsolete once it is released? What happens when Myspace gains the next killer feature? Apps don't get new features automatically, but web sites and web services do.