This has 2 benefits:
Spotify users can listen live with their favourite people e.g. long distance family or lovers, team mates getting pumped up the night before a big match, your favourite celebs or influencers who are hosting a big party "Listen live with us on Spotify and we'll be live streaming on Instagram video too!"
Music will stream at the same rate as the person they are following. They pause, you pause, they skip, you skip etc.
I've seen a 1 or 2 similar ideas, but not quite as explicit as what I've mentioned. Personally, I'd love to listen to the same music as my girlfriend who gets the bus to work whilst I drive to work (in different directions FYI)
Updated on 2018-10-29
A similar idea has been posted here: https://community.spotify.com/t5/Live-Ideas/Social-Real-Time-quot-Listen-with-Friend-s-quot/idi-p/10...
Please add your comments/votes there and reach out here if you need any other help 🙂