This makes me think of the "hypercards" in _Snow Crash,_ which "look" like business cards in the Metaverse, and are easily transferrable from one avatar to anot

This makes me think of the "hypercards" in _Snow Crash,_ which "look" like business cards in the Metaverse, and are easily transferrable from one avatar to another, but can contain vast amounts of information (such as the "Babel/Infocalypse" card Juanita gives Hiro), viruses (such as the titular one), or even money (the card Uncle Enzo gives Hiro, containing HK$25M). Stephenson probably based this metaphor on the old Apple Hypercard application, but it carries forward well into the Web, and even to an explicitly _Snow Crash_ -inspired environment like Second Life ("notecards" in SL can contain, not just text, but images and even embedded objects).