At that time, the company allowed Twitter Blue subscribers to set NFTs minted on Ethereum (ERC-721 or ERC-1155 tokens) as profile pictures, which eventually showed up as hexagons. Users could click/tap on the profile picture to know more about NFTs including details like a collection of the NFT, the contract address, TokenID, and the app with which it was minted. X has now removed all descriptions about the NFT profile picture feature from its X Premium support page.