Just wanted to know what company does SO gets its hosting services from. The site is very responsive and fast. I would like to get my hosting done in the same place. Thanks
Their host is PEER 1, visible on the footer of every page:
But it's not just the hosting service that makes Stack Overflow fast. That's a feature to the developers, and they work hard to ensure that the site is responsive.
Also see the canonical Which tools and technologies are used to build the Stack Exchange Network?