From their site 

What is Scribd?

Scribd lets you publish and discover documents online. It is like a big online library where anyone can upload. We make use of a custom Flash document viewer that lets you display documents right in your Web browser. There are all sorts of other features that make it easy and fun to publish, convert, embed, analyze, and read documents.

Part of the idea behind Scribd is that everyone has a lot of documents sitting around on their computers that only they can read. With Scribd we hope to unlock this information by putting it on the web.

What’s the story behind Scribd?

Scribd was started by Trip Adler and Jared Friedman in September 2006, and a few months later Tikhon Bernstam joined as a founder. The idea was inspired when Trip and Jared wanted to publish some of their school papers online and couldn’t find an easy way to do it. They hit upon the idea of making a website designed for people to share their documents

You can view my Documents on Scribd here