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As a user with a Farcaster account, I'd rather see someone's Farcaster username in your app than their ENS.

I interact with people's Farcaster username, not their ENS.

The namespace more closely associated with online identity and my social graph will win.

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How about apps linking to both, or many, types of identity services, and each user having a setting for order of preference? I put in ens and farcaster, etc. You choose farcaster as primary, you see that, ens as primary, you see that.

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Is @vitalik the person as vitalik.eth? 

It gets confusing and I think there needs to be one dominant namespace for users to trust who they are interacting with.

That's like saying MySpace should win over Facebook because it was around earlier.

The namespace tied to the dominant social graph will win because that's the name users will have when they join the dominant social graph and the names that they'll want to interact with.

That actually creates an argument for ENS over farcaster for identity. ENS has existed for almost seven years now, farcaster is very new. People like Vitalik had the ENS name long before Farcaster existed. His twitter being the same as farcaster gives a like, but his reddit is different from either.