On-line auction services featuring NFT's, non-fungible assets, digital assets, and crypto collectibles; On-line retail store services featuring physical and virtual merchandise; Provision of an on-line marketplace for buyers and sellers of non-fungible assets, digital assets, social media posts, and crypto collectibles known as an NFTWEET or non-fungible tweet; Provision of an online marketplace for buyers and sellers of downloadable digital assets, art, images, text, video, music, audio, animation, non-fungible tweets authenticated by non-fungible tokens (NFTs); Operating on-line marketplaces featuring non-fungible assets, digital assets, crypto collectibles, and social media posts known as non-fungible tweets; Provision of an online marketplace for buyers and sellers of downloadable digital art images authenticated by non-fungible tokens (NFTs)