Sorry, that just sounds naive. It’s all well and good until the echo chamber you live in meets a different echo chamber, which has a different idea of what’s true. The resulting conflict would instantly devolve into furious tribal warfare with people using the ‘like’ and ‘truth’ buttons as synonyms. Except with the worse feature that a popular post would seem to be additionally endorsed by Facebook as true.

Good point. 'like' and 'true' are not really different. Maybe allow people to 'like' political ads (or ads in general) will have the same effect.

Bots and troll farms would be popping champagne the day it was introduced.