If you’re a millennial beer lover (or heck, a beer lover of any age!) then you know Untappd. In this app, beer drinkers can check-in, review, and share pictures of the beer they’ve got in front of them. Simply put, Untappd is the social media platform for beer.

Co-Founders Tim Mather and Greg Avola had never met before they found one another on Twitter, and while they created the app assuming only a handful of their friends would give it a shot, Untappd now has well over 8 million users.

I met up with Greg and Tim in the middle of this year’s Great American Beer Festival in Denver, and amidst all of the beer-fueled chaos, they were able to share the story behind Untappd’s growth and the lessons learned (and beers consumed) along the way.

After you listen, make sure to head over to PubcastWorldwide.com to leave a comment and sign-up for the monthly “Brewsletter.” Cheers!