Just read this. Did not find another thread but if true not good
Quick summary
Taking info from pictures on the internet and likely other sources available to them Google and Facebook have now made it possible to find photos of firearms by simply typing a serial number into the search box. Earlier today, the automotive website Jalopnik published a story showing how license plate numbers are evidently scanned using optical character recognition (OCR) on Google images, allowing them to be searchable using text queries. Using the OCR hypothesis, TFB wondered if this image data mining technique might be able to be used to search for firearm serial numbers. Using images posted previously on TFB with serial numbers displayed on firearms, we tested the serial number search technique. As you can see from the results below, firearm serial numbers are in fact part of this apparent large-scale data mining operation by companies like Google and Facebook
Quick summary
Taking info from pictures on the internet and likely other sources available to them Google and Facebook have now made it possible to find photos of firearms by simply typing a serial number into the search box. Earlier today, the automotive website Jalopnik published a story showing how license plate numbers are evidently scanned using optical character recognition (OCR) on Google images, allowing them to be searchable using text queries. Using the OCR hypothesis, TFB wondered if this image data mining technique might be able to be used to search for firearm serial numbers. Using images posted previously on TFB with serial numbers displayed on firearms, we tested the serial number search technique. As you can see from the results below, firearm serial numbers are in fact part of this apparent large-scale data mining operation by companies like Google and Facebook

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