ways to discover content

I'd love to have a temporal relevance filter on Twitter. "Show tweets about current affairs", "Show tweets that will be relevant for several years", "Show evergreen tweets", etc. Generally speaking, there's a lot that could be done to enable users to customize their feed.

today we discover content based on the people we follow it should be the other way around - you discover people based on the content they write

As someone who very much enjoys podcasts I continue to be frustrated that so much information is locked up in opaque audio files. How do we make all of this information accessible, searchable, navigable, linkable, upvotable, etc? Great opportunity if someone does this right, imo.