CardVine puts virtual business cards on computers and smartphones. Not just raw contact data, CardVine cards are distinctive, convenient introductions to people and businesses. They’re easy to share via QR code, email, Twitter, on the web, or even on paper. And each user has a collection of other people’s cards, which the user can add notes to, search, and forward. CardVine is a “freemium” service, so users can sign up for free, or for a higher level of service, they can buy monthly subscriptions.