When you're looking at a forum, you may notice you can sort by "Hot Ideas," which is the default for your forums.
So what makes an idea "Hot"? A hot idea is one that has lots of activity in a short period of time - both votes and comments.
Can I change the default sort option for my forums? Yes, in the admin console go to General Settings --> Ideas --> Sort Ideas by, click edit, and then you can select "Hot", "Top", or "New" from a drop down menu.