The 9 startups that secretly run the Internet

Sure, Amazon, Google, and Microsoft are tech titans, making billions by selling web hosting and other services to the biggest businesses in the world.

But they can't be everywhere. And there are plenty of startups that help the web run smoothly, behind the scenes, in ways you don't even realize.

Here are the nine startups that keep the web running smoothly - and they're doing such a good job you don't even realize you're using them.