A person is hiding cash around San Francisco and tweeting hints about where people might find it.
The "anonymous social experiment" has seen a person drop $20 and $100 bills around the city.
The person said to be behind the free money told the San Francisco online magazine The Bold Italic they work in real estate and just made "a million dollars flipping one house."
Hints have included, "Usually you pay them. Today, they'll pay you," before money was taped to parking meters, and "They say vinyl is dead, but it still lives here. On a street named the opposite of love."
I ran out of change to feed the meter earlier, but I managed a couple 20's for this one now. Recognize the spot? pic.twitter.com/69gW8xEekF— Hidden Cash (@HiddenCash) May 24, 2014
People are pictured on the Twitterfeed holding up their free cash after finding the hidden stashes.
"Overwhelmed with joy at the following and love coming our way. Planning to keep on giving for the foreseeable future," @HiddenCash tweeted, adding the free cash "is not instead of charity. We support many charities too. This is for fun."
Overwhelmed with joy at the following and love coming our way. Planning to keep on giving for the foreseeable future. More soon.— Hidden Cash (@HiddenCash) May 24, 2014