Threads is testing playable music stickers in-feed, allowing users to preview songs directly in posts. Here’s what the new feature could mean for creators and music discovery. Threads is continuing its push toward becoming a more interactive social platform, with the introduction of playable music stickers directly within the app’s feed. The new feature, currently being tested with select users, allows people to attach songs to their posts in a way that can be played instantly without leaving the platform. The update marks another step in Threads’ gradual evolution from a simple text-based conversation app into a broader social discovery…