It would/could still be filtered by your social graph pretty easily.
Discussion
Would be sparse unless you followed a ton of people or you're all looking at the same house. Is there something fancier than "just show comments from people I follow?" What I think would eventually happen is you would have to get whitelist stamping organizations.
I guess maybe you could think of two tiers - people I follow and people who satisfy some criteria that allows me to see their stuff in broader settings
Yeah there’s a number of ways you can expand the set without just pulling in any random bot/spam account. One that is used by a client (can’t remember atm) is “follows of people I follow.”
You branch out one or two steps removed from your group and you still benefit from a social weighting, while also pulling for a vastly larger group of posts. But there are probably more clever ways to mitigate similar issues that others will think of.