The favorite sare a way of restricting a list of threads of your own enjoyment.
We may post in several threads, some of which we may not come back too. Every time you post in a new thread you subscribe to it.
If you find a thread you plan on coming back to on a regular basis, just select it as a favorite and it is much easier to find.
Your subscribed threads can add up quickly, and still remain alittle difficult to find a thread you wish.
Hope this information was helpful.