An anonymous benefactor has been leaving cash hidden all over San Francisco – and inviting strangers to find it through clues.

Using the Twitter handle @HiddenCash, the unnamed individual has left money under chairs and benches in public parks, on stairways and even in a unisex bathroom.

The user, who calls the programme “an anonymous social experiment for good”, leaves hints by sharing a photo of the drop-off spot, and a written clue. “Could you and 25 of your friends use a @Sightglass Coffee? Look in the abandoned phonebox next door,” one tweet said, along with a photo of a $100 (R1 028) bill.

“New drop: look under me :),” said another, which appeared to show a park bench.

Amounts have varied. @HiddenCash has shared uploads of multiple $20 bills being tucked away for curious scavengers, as well as $50 and $100 amounts.

@HiddenCash has more than 6 500 followers waiting for the next tip. The generous donor contacted online magazine The Bold Italic and revealed that he or she became rich through real estate.

“I’ve made millions of dollars the last few years, more than I ever imagined, and yet many friends of mine, and people who work for me, cannot afford to buy a modest home in the Bay Area,” the person wrote. “This has caused me a bit of reflection. I am determined to give away some of the money I make, and in addition to charity, to do it in fun, creative ways.” – Daily Mail