Just enforce a shape of the social fabric instead of worrying about specific content within that social fabric. Maintain edge quotas, not information quotas. We have tons of research on what are "healthier" shapes of network topology than what we've built.
Would you consider regulations about how precisely targeted ads may be to be "ministry of truth"?
There are a lot of ways in which the behavior of this industry could be shaped (and already has been shaped) that are not obviously manipulating social discourse in the way that "ministry of truth" implies.
If someone has a different opinion to you, then clearly they’re a troll. Or maybe a bot, or a shill, or a paid Russian propagandist influencer. And if they’re none of these things then clearly they’re the victim of one of the above, hijacking their mind.
What they’re definitely not is a real individual who sincerely believes their opinions and has arrived at them by the same process as you have.
"Hijack their brains" is quite a violent metaphor. It's a frame designed to justify strong countermeasures. But what alternative is there that isn't more dangerous than the status quo, with the potential to become a Ministry of Truth?
It's either a free market of brain hijackers or a list of officially approved brain hijackers, take your pick.