A London-based group chat app has been gobbled up by Twitter. Sphere, which at one point had 500,000 users, was co-founded by Nick D’Aloisio and Tomas Halgas in 2016 as a real-time question and answer app involving micropayments.  D’Aloisio sold his first startup, mobile news app Summly, to Yahoo for $30 million in 2013 when … Continue reading Twitter gobbles up UK-based group chat app Sphere