The much-maligned Yo app, which does nothing but let users send the word "Yo" to one another, has found a practical application in Israel where it is being used to warn people of imminent rocket strikes.
Followers of the RedAlertIsrael account receive a Yo whenever a missile is detected heading towards Israel.
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When the app users send friends a "Yo", it appears onscreen as a text alert with no other information. Since it launched in April the "unlikely hit app" has been downloaded by two million smartphone users around the world.
The creators of Red Alert – Ari Sprung and Kobi Snir – say the notifications are not intended to stand alone, but are designed to help provide information to a larger percentage of the population who may be at risk from rocket attacks.
Information for the app comes from the Israel Defense Force and the Homefront Command, Sprung told the Times of Israel.
Tech entrepreneur Dvir Reznik, told the BBC that the Yo alerts seem like an inefficient way to provide information.
"If I'm on one side of Israel and a missile lands miles away, the Yo warning is not of much use to me," he said. "However it's better than nothing and I can see this evolving into something more meaningful, but it needs more substance to make it as convenient and as useful as Red Alert".
Digital Trends' Williams Pelegrin says that even though Yo has fairly basic functionality, "there’s no denying it’s being put to rather interesting uses".
Palestininans in Gaza currently don't use any apps similar to Red Alert, The Wire says, but instead often rely on Twitter hashtags such as #airstrike for updates.
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