The idea is to build a mobile tool to collect data through toilet ID mechanism to identify, track, and resolve problems around latrine maintenance in schools (or other public latrines).

FORBES: Why Toilets, Not Cell Phones, Are Key To Education Around The World

Google in late 2007 launched Content ID, which helps identify copyrighted material so content owners can block the content from appearing on the site altogether, or in certain geographical markets.

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In the remoter corners of the Andes, textiles have been the clues used to identify exhumed human remains where ID documents are a rarity.

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Specifically, with a single ID, it makes it easier for us to identify player preferences, push them offers that are more catered to their experience, to understand their preferences and gameplay trends, and being able to track those over time.

FORBES: EA Implements 'Single Identity' System (and Data Tracking) Across All Platforms

Apple recently introduced a tool that lets developers anonymously track users, phasing out use of the old device ID that some privacy advocates said could be coupled with enough data to identify people.

WSJ: Online Ads Can Now Follow You Home

Best in class fraud detection vendors track various parameters of a transaction viz. the geo- location , device id, credit card eligibility of the consumer involved, etc. and try to identify a possible fraud, if any.

FORBES: Online fraud takes a new lucrative tack