Its not necessarily finding someone but what items may be shown in a photo.
Here is an example I can provide. Besides my regular job I also have a part time job working for a local auction company. An auctioneer who works with us on occasion recently related to us his personal experience of what can happen when placing photos on the web with all the associated camera data. This auctioneer was hired to do a primitives/ farm antiques auction about two years ago. One key set of items for the auction was an extensive collection of antique cast iron ornamental windmill weights with some very rare types. These weights were stored in one of several empty grain bins on a farm and they were photographed for the auction at the bin. Photos of items for the sale were taken a shortly before being placed on the auction web sight, several weeks before the sale.
Several days after the photos were posted on the web site all of the windmill weights were found to be missing; the loss was estimate to be around $15,000 to $20,000. Police investigators came to the conclusion that the perpetrators of the theft may have obtained GPS data from the auction site photos and had used online satellite imagery which allowed them to go directly to the grain bin where the weights were located and steal them. Nothing else on the farm was touched. There were sheds full of tools, parts, antiques but nothing else was missing.
Needles to say a lot of jaws dropped to the floor when the police announced their findings as no one involved with the auction had ever heard of such a thing.
The owner had amassed the collection over many years without a problem until the photos (with the associated camera data) were placed on the web.
PS: Just remembered this story from a couple of years ago Insurgents Used Cell Phone Geotags to Destroy AH-64s in Iraq which clearly shows what can happen if GPS data is loaded onto the web with a photo: defensetech.org/2012/03/15/insur … s-in-iraq/