What does it mean to have a social network where you can't delete anything?

I don't think we have quite grasped the implications yet

crypto social on Solana @tribedotrun | @aburra $FARTS

Is FC practically any different from X in this regard? 

In both, you can delete your content from the network, but people can preserve your content against your will be screenshotting or using APIs to download.

Technowatermelon. Elder Millenial. Building Farcaster. 

nf.td/varun

It's materially different. It's extremely hard, if not impossible for a third-party to archive everything from Twitter. 

But for FC it's so easy (by design) to have the full global state - I just need to run a hub (and make sure I don't delete anything)

Google also has indexes of all your old tweets

There has always been indexing, but the scale & accessibility is very different for web3. No API today will give me Twitter's global state (& full history). https://warpcast.com/billzh/0xded68a

Also as others have pointed out, messages are not signed on web2 social, which may give you plausible deniability

This. Web2 has a good illusion of privacy (as opposed to having actual privacy) while fc has a clear distinction of what's private and what's public.