No brand is too big to fail if it is overwhelmed by competition, new inventions, costs, or poor management

See the post Ten Brands That Will Disappear in 2012

Of MySpace: MySpace held the top spot among social networks based on visitors from mid-2006 until mid-2008, (...) Why did MySpace fall so far behind Facebook? No one knows for certain. It may be that Facebook had more attractive features for people who wanted to share their identities online. It may have been that it appealed to a younger audience which tends to spend more time online.