Our biggest release yet features a new feed for improved discovery, a new Library for listening later or offline, video highlights with captions, web playback, transcripts, calendar, and much more. — Since launching Callin two months ago, our team has been hard at work onboarding incredible creators and improving the product, fusing the concepts of social audio and podcasting into an experience we call “social podcasting.” Today, I’m excited to announce our biggest upgrade yet, version 2.0 of Callin. This release…