Earlier in the year, during its annual developer conference, I/O, Google announced that it was working on a brand new video calling application called Duo . The promise made by the company on stage and in its promotional materials was that Duo would be the video chat platform for the every man. It was to be a stripped-down, no-frills, sans bells and whistles experience that users could just pick up and use with minimal instruction. It would also allow both Android and iOS users to chat with each other, seamlessly. Having tested the app out personally, I have to say that as a no-frills, easy-to-use video calling app, Duo is fantastic. (Photo by Justin Sullivan/Getty Images) You simply tap the call button, tap a contact’s name and the call is initiated automatically. The best thing is that Duo is tied to your phone number so you can call people in your existing contact list without having to maintain a separate one specifically for Duo. In essence, I like to th...