Two bipartisan senators have formally questioned TikTok leadership regarding the company's handling of an algorithmic safety experiment launched in 2021. The company had developed a feature intended to reduce 'filter bubbles'—situations where users receive repetitive recommendations within narrow content categories—but selectively restricted access to this protection for millions of users in order to establish a test group and measure how the feature might affect engagement levels.

The inquiry gained urgency following reports that Chase Nasca, a teenager whose account was part of the restricted group, died by suicide after being exposed to repetitive recommendations focused on self-harm and suicidal ideation. Internal company documentation indicated his account had fallen into precisely the kind of harmful content loop the withheld feature was designed to prevent. The senators' letter demands that TikTok disclose whether similar safety features were withheld based on business considerations, with a September 1 deadline for response.