IMHO, social media is the initial use case for #nostr but the not the killer use case. Reminds me of the early days of the web when everyone set up their own home page, then abandoned. It might take a few iterations, but I believe #nostr will give rise to an entirely new ecosystem that we have not yet envisioned.
Discussion
I've been thinking the exact same thing, but I have to admit the uncensorable usefulness of nostr to freedom & political activists is off-the-charts obvious. I'd be surprised if it doesn't catch on as a social media where all 'dangerous talk' is done. That ain't peanuts.
A lot of it is still hypothesizing, bordering on crazy-talk, but the sooner we figure out the core value and essence, the better.