Google Images

I'd like to know if this a feature as well. I highly doubt it unless it were a picture of a face or animal. Then you could tag it as a person and search by that person's face if that makes sense. More on reddit.com

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Pinterest apparently, my image searches are polluted with stupid Pinterest hits. More on reddit.com

Spitballing, but the algorithm to do the anlysis and communicate with their image database is probably too much for most cellphones. Plus, they can better manage memory if the reverse image search engine is controlled in their shop. So, yes, I would guess a high probability that it is uploaded. Since there usually won't be a lot of metadata or tags associated with what is in the image it wouldn't have value to the image search provider. More importantly if they did post on the internet it would break privacy rules in some countries and at least one US state. If users found out about the practice then they would opt out and use a competing solution . Almost certainly the majority of these images are deleted from a temp location without human involvement. Some images which caused problems would be examined by a programmer to determine the error and fix their process. Also likely they have child porn filters so that they themselves don't pick any up when they crawl and prevent strange people from using their service to find illegal images. More on reddit.com