geolocation.
Geolocation should be something one has to opt in for as opposed to know they must turn off that setting. Minors that end up in internet chats where they share pics that they think are innocent and safe to share ie. they are using a fake name, don't realize that their location can be detected in their photo. This is makes kids are greater target for pedophiles. Many parents are not knowledgeable enough about technology to realize the risk their children may be exposed to.