GS_raw = wS x (Shares / Reach) + wC x (Comments / Reach)
+ wK x (Link clicks / Reach) + wSv x (Saves / Reach)
+ wE x (Reactions / Reach) + wR x clip(Reach / AverageReach, 0.5, 1.5)
GS = GS_raw x Scale
GP = round((GS / Scale) x Reach x AudienceFactor)