Tracking Users coming from a certain source
===

I'm giving promotions to users who sends us other visitors. This is done on the **client side**.

I can do this using dynamic GET parameters, e.g. `http://www.mysite.com?app_source=user_id` or I can do this using the hash, e.g. `http://www.mysite.com#app_source,user_id`.

Are there any pros and cons for any of these methods?

Thanks!