But the web isn't "single interest" and, as you yourself referenced, there are open standard ways (RSS) to compile information from across it. This may have evolved more without FB so heavily dominating the scene.
Most of this long-tail stuff we're talking about here had minimal or no web presence before FB created "alternative web publishing" experience for them. And centralized easy experience for their audience to follow what they like.
I still use RSS, but sadly, that's not where I find news from local music school or running group. Could it end up differently if FB didn't show up? Quite possibly.
