It all Big Data and it's becoming impossible to avoid. Remember the scene in Minority Report when stores directed personal video advertisements to shoppers by name as they walked into a store? It's coming. Since sites such as Facebook know what products you are looking at on a stores website, or those sites directly, you could then be targeted via an ad as you walk into that store using facial detection.

How could a store know that the face detected is you though? Well, thanks to Apple with the iPhone X and soon Samsung your phone can be unlocked using facial recognition. If Apple or whoever then sells those facial detection records to Big Data companies....