A GroupCard allows multiple people to contribute to a single greeting card or gift. It aims to be an "Evite for greetings and gifts" and a "Facebook wall, but open and directly monetized". The document discusses GroupCard's potential for growth, noting it could generate $0.10 per card for 1 billion "card events" in the US annually, equating to a $6-7 billion market opportunity if positioned as a gifting platform. It highlights GroupCard's growing monetization and zero-cost user acquisition model, with nearly 1 million user accounts and high engagement metrics.