GS_raw = wS x (Shares / Reach) + wC x (Comments / Reach) + wF x (Follows / Reach)
+ wK x (Website taps / Reach) + wSv x (Saves / Reach) + wL x (Likes / Reach)
+ wR x clip(Reach / AverageReach, 0.5, 1.5)
+ wImp x clip(Impressions / Reach, 0.5, 2.0)
GS = GS_raw x Scale
GP = round((GS / Scale) x Reach x g(Impressions / Reach) x AudienceFactor)