Exactly what it says on the tin. Somebody make a riddle. Other people in the thread have to figure it out. The person who guesses correctly gets to make his/her own riddle for people to solve. You can only make up a riddle if you solve someone else's.
"I snip off the branches that grow in the class.
I turn the soft orbs into orbs of glass.
I pivot the world on a sluggish view.
I pivot the thoughts askew
The longer you're under, the less you see
You lie to yourself and say you need me
What am I?