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Re:Snap’s Drop in Active Users Could Signal a Social Media Peak by dcposch on Wednesday August 08, 2018 @03:40AM (#17713913)
Lunch Club is almost exactly what you described.

lunchclub.ai

So far I've found it to be a lot of fun

Re:Snap’s Drop in Active Users Could Signal a Social Media Peak by mikestaub on Thursday August 09, 2018 @02:08AM (#17721951)
I built something very similar you might also enjoy: slacklunch.club