There used to be a review:work ratio, but that's gone now. So no, technically you don't need to review before you post work. However, it's definitely recommended that you review, and the more you review the more reviews you'll get on your own work!
-Amy
"It is curious how often you humans manage to obtain that which you do not want."
More than anything she wanted the world to be uncomplicated, for right and wrong to be as easily divided as the black and white sections of an Oreo. But the world was not a cookie. — Roshani Chokshi, Aru Shah and the Tree of Wishes