This is a terrible idea! You just read an article about PR firms editing articles about science & history. Facts are the least democratic things of all!
Do you want people to vote on science? How many people think Relativity is just E=mc^2? They ignore all the import aspects about it. If there wasn't a maximum speed (speed of light), then kinetic energy (KE=mv^2) would go to infinity and create unlimited energy.
Do you want people to vote on History? Well, they did, and the Holocaust only killed Jews. The other 5 million killed for handicaps, homosexuality, and others don't count. There were even 3 more genocides in the 20th century alone: Pol Pot's Cambodia (the educated), Serbia (muslims), & Rwanda.
I don't want popular opinion to warp reality anymore!
And you even left off the Armenian Genocide.