YikYak was very popular at my univeristy back in 2014. What replaced it? Or has anonymous social media fallen out of favor all together?
I think the main reason anonymous social media is out of favor is that it's hard to monetize. It's hard to gather information (and thus serve valuable ads) about your users when they are explicitly using your app to not share that information. When yikyak introduced profiles, I think that was when everybody stopped using it.
Is it more EU-targetted or seeded initially?
Another geolocated thing that briefly existed was Google+ - at one point and only on mobile if you stopped the screen to the right there was a "Nearby" listing that showed public posts within some geographic radius that was never quite clear.
> When the service was accessed with a supported mobile device, Buzz tagged posts with the user's current location.
I'll use as the example Pokémon Go, which within the last month revised a major part of the game to introduce a feature that requires teams of people to defeat (gym raids). This has ended up with an assortment of tools being used in attempts to organize those teams, as well as some folks simply showing up and hoping others do the same. These include multiple fan/independent Discords, Facebook, and at least one browser map-based "I'm going to X" solution. Yik-Yak's geolocated chat (minus the anonymity that caused them so much trouble) seems like it would have been an excellent framework for for local team chats.
Whisper still exists