[tiagod]

I'm thinking it might have the opposite effect for anyone that doesn't trust Facebook

[rndgermandude]

I don't know anybody who trusts facebook (the company).

But I do know a few people who are all to eager to trust everything that gets posted on facebook, and a sizable chunk of these people would indeed take such an "extremist warning" by facebook to mean that "they" are trying to hide things from the public.

[0xy]

All of my right-wing friends and acquaintances who received this message mocked it and took it as more evidence of Facebook's bias, so I'd say it was inversely effective.

It will reinforce views.

[KozmoNau7]

You can't really reason with True Believers, especially not if you're someone they already deeply distrust.

[lazyeye]

Either that or Facebook is biased, and it is completely reasonable to mock them.