Hidden Cash Mystery: Altruism Striking Again

Clues floating around Twitter as mystery money is hidden across one American city.
1:45 | 05/26/14

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Transcript for Hidden Cash Mystery: Altruism Striking Again
Look at that face. Is it a marketing employ? As for the people who found the cash and they'll tell you it's the real deal. Across San Francisco, they're on the hunt for money. Why is it tucked in every conner of the city. ABC's nick watt tracks down the money man. Reporter: San Francisco is going gaga for hidden greenbacks. A mysterious millionaire is stashing cash around the city, and tweeting clues like this. "Find me at the highest place in the park under a place for dog owners." From that, Samantha Kane found a hundred bucks in a dog dirt bag dispenser. My hands were completely shaking and I ran down the hill to find my fiance. Reporter: Thousands of treasure hunters await every new clue. Who is this robin hood spreading the weather in this, the most economically divided city in the country? We got him on the phone. How did you make your money? I'm a real estate developer. Reporter: And roughly how rich are you? I'd rather not. It's in the millions. I don't even know exactly. Reporter: And he plans to remain anonymous. Are you making a point here? My point would be to encourage people who have been successful to give back a little bit more. To pay it forward. Reporter: Like that anonymous restaurant tipper who's left $130,000 in gratuities across the country, @hiddencash seems just too good to be true. How much are you gonna give away? I haven't put a figure on it. It's probably gonna reach at least in the hundreds of thousands. Reporter: He'll splash the cash in L.A. This weekend, but beyond that, not even he knows where or when. This mysterious millionaire told me he's just flying by the seat of his pants. Nick watt, ABC news, los Angeles.

This transcript has been automatically generated and may not be 100% accurate.

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