In Rick Riordan's books, "Iris Messaging" is a type of video message that is used by the Greek gods and demigods to communicate with others using a rainbow. The service is managed by the Greek goddess of the rainbow, Iris.*
But with today's technology, I would think Iris Messaging has kept up with the times as well. It's a must for businesses afterall.
*source: camphalfblood.wikia.com/wiki/Iris_Message.
