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SAN FRANCISCO (AP) — Someone’s dropping envelopes full of cash across San Francisco, causing a social media frenzy.

The mysterious person with the Twitter handle @HiddenCash has been hiding money throughout the city since Friday that’s leading scores on a scavenger hunt. His Twitter following has exploded from a few hundred on Friday to more than 80,000 and counting by Tuesday.

Hidden Cash’s creator says his giveaways are a “social experiment for good.” He claims to make his money off San Francisco’s hot real estate market and hopes that winners also pay it forward.

Adam Wenger, a 27-year-old web producer, said he won $200 finding two envelopes Friday in the city’s South of Market District. He bought pizza for his co-workers on Tuesday and will pay a $100 parking ticket.