I have an idea for an app. I do not program. It's social in nature but will be used for business purposes. How can I create this cheaply?

There are sites out there that you can rent coders to do projects like this:
http://www.rentacoder.com
http://www.elance.com

Unfortunately, if you do not know how to program, you either need to a) learn how to program or b) pay someone to program it for you. There are many books and websites out there on learning to program, but there is a reason people go to school for years to learn programming. Like any other career, anyone can learn the basics, but to do it well, you need to learn proper techniques, best practices, etc...