This blog post on techcrunch provides information about several free apps that have been developed to remove metadata and blur faces in photos.
This resource and the following information was contributed by Kaye Stevens.
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The apps were developed in response to concerns about the surveillance of protesters using photos on social media. The apps allow faces to be anonymized and apps that remove meta data make it harder to identify the source and location of the image.
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These are useful tools for helping to protect people’s privacy, particularly when photographing groups such as protesters where express permission to be photographed has not been given.