True. It sets rightfully under the engineering category, because all this does is just engineering. At scale is challenging, but with Facebook's resources, it i

True. It sets rightfully under the engineering category, because all this does is just engineering. At scale is challenging, but with Facebook's resources, it is more like problem waiting to be tackled, but the stakes are not high, because it CAN be tackled, just how much resources you want to pour into. What makes this mildly interesting is the IGQL, but again, without knowing the full syntax, it feels pretty restrictive. Youtube is doing much more advanced stuff, like Reinforcement learning@Scale, as comparing to Instagram in this regards.