"Favoriting" a feed is more than just a "Like". It's a value exchange that provides hosting & storage on the IPFS network to support your favorite podcasts. Every heart on a feed is an IPFS node hosting feed content.
There are two modes to favoriting.
Showing "Love" means better performance and more decentralization to ensure the podcast won't disappear.
How to Favorite
If you are running multiple nodes, you can selectively favorite each node to manage your storage space. Each heart represents a node. Hovering each icon will show your current pinned usage to help you decide which node to use. Node hearts display least usage to most.
As a podcaster, you can setup an IPFS node and favorite your own feed to ensure your episodes are always available. And encourage your "super fans" to return value by donating storage and bandwidth to support your show.