The aggregation of information should never be censored; it is telling you where things are out there in the world.
As a loosely related topic; the conveyance of truthful or believed to be truthful information should never be suppressed. However polity asking someone to be quiet for a time or for some other reason might be. This is why I believe 'state secrets' and secrets of all other types should only be for a specific limited time, and that all official records MUST receive re-classification on a regular interval (say once every 10 years, but a new review party who must also agree that it's worth keeping secret for another 10 years). Failure to review should result in publishing ~1 year after the expiration period.