Mark Zuckerberg’s net worth was reduced by nearly $5 billion as Meta shares declined on Thursday, dropping him among the ranks of the world’s wealthiest after Reuters reported Meta projected a chunk of revenue would come from running advertisements for scams.A stock dip comes after Reuters reported Meta estimated a chunk of revenue would come from running fraudulent ads. Getty ImagesKey TakeawaysShares of Meta dropped 2.3% to around $620.75 as of Thursday morning, adding to a roughly 17.5% slide for the stock over the last week, which includes a single-day drop ofmore than 11%after Meta posted third-quarter earnings.Zuckerberg, who was ranked the world’s third-richest person early last week behind Oracle’s Larry Ellison ($298.8 billion) and Tesla’s Elon Musk ($496.5 billion), respectively, nowranksbehind No. 3 Jeff Bezos ($257 billion), No. 4 Larry Page ($235 billion) and No. 5 Sergey Brin ($217.9 billion).Zuckerberg, who holds roughly 13% equity in Meta, had his net worth reduced by $4.6 billion (2.1%) as Meta’s shares dropped.Why Are Meta Shares Down Today?ReutersreportedThursday, citing internal company documents, that Meta projected 10% of overall revenue—estimated at $16 billion—would come from running advertisements for scams and banned goods. Meta spokesperson Andy Stone told Reuters the documents cited by the outlet “present a selective view that distorts Meta’s approach to fraud and scams,” noting the company’s internal estimates were lower and that the 10% estimate included “many” legitimate ads.” Stone declined to give an updated figure to Reuters (Meta did not immediately respond to a request for comment to Forbes). Other documents indicated Meta was under investigation by the Securities and Exchange Commission for running ads for financial scams, Reuters reported. Regulators in the U.K.reportedin 2023 that Meta’s products were involved in 54% of all payment-related scam losses that year, more than double all other social platforms combined.Key BackgroundMeta’s stock has rebounded after falling to a low this year in April, though shares have steadily declined in recent days. Arecent slipin share price followed the company’s third-quarter earnings, which featured earnings per share of $1.05, falling 84% below economists’ projections, according to FactSet. That dip was attributed to a one-time tax charge of $15.9 billion because of President Donald Trump’s One Big Beautiful Bill Act, Meta said, adding earnings per share would have been $7.25 without the tax charge. Meta also raised its guidance for capital expenditures from between $66 billion and $72 billion to between $70 billion and $72 billion. Zuckerberg said this change was necessary as Meta was “aggressively” preparing for the arrival of superintelligence.Look back on the week that was with hand-picked articles from Australia and around the world.Sign up to the Forbes Australia newsletter hereorbecome a member here.This story was originally published onforbes.comand all figures are in USD.Cristiano Ronaldo—world’s highest-paid athlete—says this custom item is his most expensive purchase everInside the exclusive world of traveling for high-end health treatmentsWhere business meets style: Inside an evening with Forbes x Max Mara