If you go to the Get Connected tab and click "Groups," you will see a list of groups you can join. The format of the groups is less like this Forum and more like a Facebook group -- a little more casual and a lot more collaborative. Find a group that shares your interests, and join up!
Hot Tip Part B: Do you have a group you'd like to be in, but it doesn't exist yet? Any member can start and run a group with admin permission. Go ahead and start it up, then DM me so I can push it through for you.