Plaxo was an online service launched in 2002 that aimed to help users manage their contact information. It allowed individuals to store and synchronize their address books across various platforms, making it easier to keep track of friends, family, and professional contacts. Users could also share their contact details with others, ensuring everyone had the most up-to-date information. In addition to contact management, Plaxo offered features like calendar integration and reminders. The service gained popularity for its ability to connect with social media platforms, allowing users to import contacts from sites like Facebook and LinkedIn. However, it eventually declined in usage and was discontinued in 2017.