I just typed "expanda forum" into firefox and this was the first result. The best way to find out anything about anything is usually by people that already have/use it, so forums are a first stop for me when researching anything.
1. large, as in size, height, width, or amount: a big house; a big quantity.
2. of major concern, importance, gravity, or the like: a big problem.
3. outstanding for a specified quality: a big liar; a big success.
4. important, as in influence, standing, or wealth: a big man in his field.
5. grown-up; mature: big enough to know better.