Location, swiping and email invite

Hello, I have several issues. I am building quite a complex app and I need some guidance. I see a couple of Places plugins but there is zero documentation on how to use it. I need just cities when a user starts to type. Is that possible?

Next, is there some way of making swiping (like Tinder) of collections of images? The last, I want to have closed community so I want users to invite each other, is there some ready-made system for this or how would I achieve this?

Thanks.

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