Podcast:99% Invisible Published On: Wed Dec 17 2014 Description: If you want to follow conversation threads relating to this show on social media—whether Twitter, Facebook, or Instagram, Tumblr—you know to look for the hashtag: #99pi. In our current digital age, the hashtag identifies movements, events, happenings, brands—topics of all … Continue reading → Subscribe to SiriusXM Podcasts+ on Apple Podcasts to listen to ad-free new episodes and get exclusive access to bonus content.