[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.