Break it 'till it breaks

Let as many people as you can grab to break your application as much as possible before it goes to production.

Some may ask, wouldn't it be better to let a professional this stuff?

Well, the point is: Let the "professionals" handle complex methodologies as this stabilizes focus; and the rest should just keep using the site normally. There are differences between cultures of both sides, thus, different usage of application.

For example, do you use Facebook the same way as your mother? I don't have to state the obvious, do I?

This will open gateways to insights that may help you handle simple problems that may arise even from well-quality assured applications.