YO! is a messaging app that enables users to send the word 'Yo' to friends and receive 'Yo's back. It's designed to be a very simple way to connect with friends and get their attention.
YO! is a messaging app released in 2014 that enables users to send push notifications containing the word 'Yo' to friends who also have the app installed. When someone sends a 'Yo', the recipient gets a notification saying 'Yo' along with the sender's name.
The app was created as an extremely simple way to get the attention of and connect with friends. By sending a 'Yo', you are essentially saying a simple 'hello' or 'what's up' to the receiver. If they send a 'Yo' back, you know you have their attention and can start a conversation.
YO! became popular when it launched because of its novelty and simplicity in a world filled with complex messaging platforms. The app creators wanted to build the simplest possible communication tool. While it lacks rich features, its core purpose is to send a fun little ping to friends so they know you're thinking of them.
The app is free and available for iOS and Android devices. It has expanded over time to add some additional features like being able to attach links and locations to your Yo's, but the core functionality still remains focused on simply sending the 'Yo' notification back and forth.