The premise of Yo — the app that just lets you say yo to other people — may be ridiculous, but its being put to some pretty complicated uses. According to The Times of Israel, a pair of developers are now using Yo as a way to alert people of terrorist attacks throughout the country. The simple notification will come through for any Yo user who subscribes to updates from Red Alert: Israel. Traditionally, Red Alert works as a standalone app that sends off more detailed push notifications about the same types of rocket, mortar, and missile attacks that Yo users will be notified about.
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