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

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.

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

Interesting point. In addition to making single tribe networks more useful, we also need to create tools that allows for signaling membership into these groups.

A version of this thesis I've been developing: web3 is decentralized but people are not.

web2 centralization was a technical bottleneck to tribalism. Henceforth no more.

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all tribes (apps) need their own platforms (chains) but they all converge (settle) in the common place of IRL (ethereum)