Intel and Microsoft
Clearly I must be dated. I see the dominance of Intel and Microsoft as having an obvious effect on competition and innovation. But Google? Free Android, and a better search engine than AltaVista. What's not to like? And Facebook? What does that have to do with innovation? Who needs it?
Of course, ten years from now, I expect we'll all have to find some other search engine, because Google will collapse by not managing to monetize these wonderful free services it's giving out enough to pay for them - thus the investors gambling their money will finally tire of it. Probably I'm all wrong, and haven't been paying enough attention.