The details of Facebook’s purchase of Instagram are still leaking out, as the top newspapers continue to source their own respective versions of Zuckerberg’s manic impulse buy. The Wall Street Journal is now reporting that after Zuckerberg first phoned Facebook COO Sheryl Sandberg to outline his intentions of buying Instagram on April 5th, he reached out to Instagram CEO Kevin Systrom directly instead of through lawyers as to further convince him to agree a deal. At that point, Systrom asked for $2 billion for his company. Over the next three days, Zuckerberg and Systrom hammered out the deal in the former’s home, eventually settling at a price of $1 billion. Zuckerberg then finally notified his board of directors when the deal was pretty much all said and done.