Instagram is in the business of data-collection and media selling. It's estimated value is more than $100bn (£77bn).
Third-party indexing tools glean data from what is posted and sell it in the form of brand analytics, as information for governments, security and surveillance firms, and corporations.
Images posted to Instagram are used to train its proprietary image-recognition software.
Instagram follows your movements across the Internet, and you find hints that it is stalking you.