According to venture legend John Doerr, Google is designing its own silicon for its data centers. But he stopped short of confirming rumors that the search giant was designing ARM-based chips as was reported in December. Doerr, speaking at a chip conference, also said that Facebook would be next. He’s right. Computing is the primary cost for Google, Amazon Web Services and Facebook and designing their own silicon could lower that cost. And thanks to more modular designs and advances in the ARM architecture, the cost of designing custom chips has fallen into a range where the benefits outweigh design costs.