What are some alternatives?
When comparing AdBarker and Serendipity by Spotify, you can also consider the following products
Anchor.fm - Record bite-sized podcasts that anyone can join ⚓
Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm
Transistor.fm - All the tools you need to build & grow your podcast 🎙️
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.
ZCast - Live interactive podcasting with your Twitter followers
Google Play Music - Free radio for everything you do. Store 50,000 tracks from your personal collection. Subscribe for on-demand access to 40 million songs and offline listening.