Instagram will let users endlessly swap the audio on old posts

There's a symbiotic - and sometimes frustrating - relationship between social media sites and the creators that depend on them. Platforms need influencers' and creators' content to keep consumers on their apps; the creators, in turn, need to be able to reach those audiences to justify creating their content in the first place. Creators want a seamless way to make and disseminate their content while being able to make money; audiences want a bottomless feed of entertaining things to look at. And…