GOING GOOD: Farb Nivi of Grockit, entrepreneur and startup-mentor extraordinare, announced "Grockit for Good," what he calls a "fundamental shift" in its business model. For every premium account it sells, Grockit will provide a year of free access to the Grockit Academy (grades 7-12) for an underserved youth. The likes of KIPP, High Achievement, TLABS and others and footing the bill. Smart move to ramp usage and burnish the brand.