How is @pmarca crossposting from Twitter? Feels unlikely he's doing it manually since its a lot of effort and he's not replying to anyone.

He only has one on-chain signer for Warpcast. Does Warpcast crosspost for him?

Looks like Warpcast is experimenting with a x-posting feature for influential  Twitter accounts: @pmarca, @micsolana, others? 

Proof in thread. Good feature and I like the attempt to increase content on FC. Hopefully available to everyone soon.

The only iffy thing is whether this is being done with/without permission

billionaire media tycoon and former mayor of san francisco. disinformation researcher. cmo @foundersfund. editor-in-chief @piratewires. 🏴‍☠️

web3 social all-in-one. 
crosspost to Farcaster, Twitter, Lens and Bluesky | yup.io | iOS: https://t.co/gJH0Bi07r4 | Android: https://bit.ly/3uaTz4T

Nope, it's Warpcast-native since that's the only signer thats registered. Seems like Warpcast will be moving towards x-posting like yup