Meta has lost its Media Rating Council (MRC) accreditation for ad metrics related to its Facebook and Instagram feeds. The MRC is a non-profit organization that manages standards for media measurement, and its accreditation is considered a seal of approval for the validity and reliability of a company's audience and ad impression data. The loss of this validation could raise concerns among advertisers about the accuracy of Meta's reported metrics. This development is significant for Meta, as the vast majority of its revenue comes from advertising. Advertiser confidence is crucial, and the absence of MRC accreditation could lead to increased scrutiny of its ad performance data and potentially influence where brands allocate their advertising budgets. The specific reasons for the withdrawal of the accreditation have not been detailed in the initial reports. There is no immediate market reaction analysis available.