Identity, Graphs, Feeds and Frames.

These are Farcaster's strengths. Many things can be built on-top of that.

The fact that FIDs can be connected to verified wallets expands its composable identity space significantly.

The fact that casts can point to any URL and that they can be parented to any URL expands its composable data space significantly.

Anyone building on Farcaster isn't limited by just the data provided by the protocol. You have access to the wallet space and you have access to the data linked to by casts.