The trend is spreading, according to Jamie McDonald of the Giving Tuesday charity.
"If you think about a lot of younger people, who don't necessarily feel that they've got lots of money to give to a non-profit, but to be able to buy someone coffee or a sandwich — that's what we love," she said. "We all have something to give, whether it's our time, our talent, our encouragement, and we see those acts of kindness all over the world, and it's truly inspiring."