Satya Patel joined Twitter in March of 2011, after a four-year stint as an investor with Battery Ventures. He took on the big job of managing the company's core product as well as its growing advertising business. But now, as its ads are starting to take off, he's leaving the company.The decision was amicable, I've heard from a source familiar with the matter. Twitter's executive leadership is looking to separate the ads and product teams more fully, with each one getting a new leader. Patel's options were to take one of those roles instead of continuing to run both.“Satya has done a great job building out an amazingly talented product team," a spokesperson tells me today, in confirmation "We’re grateful for everything he’s done and wish him the best.” read more..