If you watch this part of the congressional hearing, you can see that at least Zuckerberg is clearly not an anti-vaxxer: https://youtu.be/9EgrrR1M2Ck?t=3938 htt

If you watch this part of the congressional hearing, you can see that at least Zuckerberg is clearly not an anti-vaxxer: https://youtu.be/9EgrrR1M2Ck?t=3938 https://youtu.be/9EgrrR1M2Ck?t=3938 I assume that their ad filtering task is just a really hard problem.