Finding the three local birds and a local picture for every point on the globe
51Degrees geolocation APIs can certainly be used to locate a user simply to store that location, but they can also fit together with other APIs and other data to pull geolocation of any point on the globe into your dataset.
Take, for example, Which Three Birdies, a slightly silly example of how to combine 51Degrees suite of world-class Reverse Geocoding APIs with Xeno-Canto's freely-available database of bird calls and Wikidata's huge collection of imagery and structured data to produce a "birdday card", finding the three local birds and a local picture for every point on the globe.
Don't pay any attention to the "trademarks", but DO pay attention to the detailed essay where authors Stuart Langridge and Bruce Lawson describe how the site works. And keep an eye out for more in this vein. Chirp cheep!
Visit Which Three Birdies to see how it all works.