A method for identifying unknown third parties appearing within video call data based on generated image characteristics data. A user's computing device and a participant computing device may exchange and render video call data in which the user's computing device may display the unknown third-party. The user's computing device may generate image characteristics data based on selected imagery. The user's computing device may compare the image characteristics data to stored contact information on the user's computing device to find a match, and may transmit the image characteristics data to the participant computing device for comparison with local stored information stored. The participant computing device may transmit a report message to the user's computing device indicating whether a match is found. In an embodiment, a server may transmit the facial data to other devices for comparison. In another embodiment, the user's computing device may request contact information from participant computing devices.