Sort of off topic but related...

I wonder how the homeless will fair when we become a cash-less society. This may be far off but it's inevitable.

While initially one might think the homeless will be worse off, I can imagine technology actually improving things. Imagine some sort of NFC chip or ID a homeless could obtain from a shelter that would allow someone to give money to them from their mobile phone...and then perhaps gamifying the goodwill (leaderboards based on city or social graph) for the donators.