Farcaster is a single-tribe network, not a social network.

Big difference.

I do wonder how quickly networks need to become multi-tribe to stay relevant for the long term

One thesis is that we are entering the age of "network defect" — where the disalignment you get from squabbling tribes outweighs the advantage of having them all on one platform.

If so, we may need to make single-tribe networks more *useful* for doing things. 

Example: a designer guild network integrated with Figma

IMO "design" is made up of many tribes actually — but interesting point on the pendulum swinging away from aggregation

Yeah, agree — the clustering might not be by profession, but by ideology across professions. Though some professions may very disproportionately lean towards one ideology or another.