The Verge – What is a tracking pixel and what was Superhuman up to? Is it true that an app called Superhuman lets me spy on people using email? That’s what we heard, too: When you sent an email using this $30-a-month invite-only app, it automatically tracked every time a recipient looks at that email, and even showed you their location. That’s because it uses hidden pixel trackers, according to a viral blog post from Mike Davidson, former VP of design at Twitter. BTW we love your energy here, already assuming you’re going to be the one spying. That’s an excellent analogy for what Superhuman was doing with email trackers. They were on by default, tracking anyone you send email to, whether that was your intention or not…”