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comment by Brasher
Brasher  ·  3835 days ago  ·  link  ·    ·  parent  ·  post: Facebook’s Slingshot Challenges Snapchat With ‘Reply To Unlock’

That's just poking someone on facebook, without having to actually provide any sort of meaningful service. I could see this being used as a sort of pager though, if the latency between "yo's" isn't too high.