Tango Card users start WIG on the app, attach or take a picture of what they got, and select how to share the photo, via Facebook, Twitter, or a Picasa or Flickr album.

Give And Take: How The Rule Of ... Kunz sent his Christmas greetings: handwritten notes or a card with a photo of him and his family. And then Kunz waited to see what would happen. Enlarge this image.

With a vaccine mandate for many indoor businesses taking effect in Boston on Saturday, city officials are also preparing to launch their own digital vaccine card app.Boston Mayor Michelle Wu's "B ...