I think these are generally somewhat true, but with a lot of glaring counter-examples. As the companies that control these spaces get larger, there will always

I think these are generally somewhat true, but with a lot of glaring counter-examples. As the companies that control these spaces get larger, there will always be room for smaller, disruptive competition, especially in more domain-specific areas. I'm reminded of an article from HN earlier this year wherein a Harvard Professor admitted telling Mark Zuckerberg he was chasing his tail trying to create a social network. (Anyone have this link?) In 2004, a plain old social network probably wouldn't have worked, but a Social Network of Ivy League colleges might.