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This is for if I want to fly somewhere on the same flight as my friends?

Or it's a reverse auction site for plane tickets, but then I don't understand why I need to get my friends involved.

(I'm totally not interested in this, but that's because I don't fly.)

It's a reverse auction site, you can chose to leave your CC and buy the ticket when the price becomes relevant automatically . The social aspect of it is that you can create a bid and invite your fiends on it , each of them can bid for a ticket as well (on his/hers price) but the order can only be completed if someone agrees to fly all your friends on the same flight for the total of the bids

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