"CNN, if you put this on for us to read, then you should allow us to donate, " wrote Brian Quinn.

CNN: Help is on the way for Youssif

Answering Republican calls for the mega-billionaire to donate money to the US Treasury if he wants to help with deficit reduction, Mr Buffett told Time magazine they should all join hands in the effort.

FORBES: Warren Buffett And The Collective Action Problem

Americans could be reluctant to donate to an organisation that the US justice system regards as pirates.

BBC: Politics at play in Sea Shepherd-Japan whaling wars

It was founded by the US Professional Convention Management Association to donate excess food from meetings and special events.

BBC: Business travel gives back

Many travellers post "donate" buttons on their blogs, ranging from "buy us a beer" to requests for cash in return for useful travel tips.

BBC: The ethics of asking strangers to pay