Trump threatens to 'close' down social media platforms

There's an unsolved conundrum I haven't heard mentioned yet.

After the 2016 election, there was a thought that too much false information is spreading on social media. This happens in every country and across every form of communication - but social media platforms seem particularly worrysome (and is particularly bad with Whatsapp forwards in some Asian countries).

So what should the social media companies do? Censor people? Disallow certain messages (like they do with terrorism related posts)?

They settled on just putting in fact check links with certain posts. Trust in the fact deciding institution will of course be difficult to settle. No one wants a ministry of truth (or the private alternative).

So the question remains - do you, or how do you lessen the spread of misinformation?

Whatsapp forwards is largely a solved problem. Now you can't forward whatsapp messages to more than 5 people at a go. And if you try doing 5 people at a time consecutively, your account is automatically deleted even before you reach 30 total forwards.

Some people adopted a strategy of adding users to a group and dropping whatever message they have but that too is solved by allowing only known contacts to add you to groups.

Your solution is to ban humans from talking to more than 5 others at once?