With help of "cloud" any web site of app could do similar.
Amazon Rekognition – Deep learning-based image analysis
"Amazon Rekognition is a service that makes it easy to add image analysis to your applications. With Rekognition, you can detect objects, scenes, faces; recognize celebrities; and identify inappropriate content in images. You can also search and compare faces. Rekognition’s API enables you to quickly add sophisticated deep learning-based visual search and image classification to your applications."
Face API - Facial Recognition | Microsoft Azure
"Detect human faces and compare similar ones
Organize images into groups based on similarity
Identify previously tagged people in images"
Google Cloud Vision API Documentation | Google Cloud Vision API Documentation | Google Cloud Platform