I don't think many people saw the decline of Yahoo or MySpace coming. Companies can very quickly become unpopular. They will exist for another decade or so bef

I don't think many people saw the decline of Yahoo or MySpace coming. Companies can very quickly become unpopular. They will exist for another decade or so before being bought for a cheap price. I'm very certain it will happen to Google and Facebook just because so few companies dominate a market for more than 20 years or so, especially if there are no large start up costs. However, that doesn't mean one company will take over what Google or Facebook do. It could as well be companies doing something else, but taking away the main revenue streams.