Biden is right about facebook and there should be something done about them but doing that before an election is quite risky. Normally if I were him I would just say that he likes Mark Zuckerberg and there is a problem that they need to fix but they are working on that and I would say if I become a president I would sit down with Mark and will help him overcome this issue and government could lend help with anything they need to fix this problem and so forth.

That way you are both saying it is not Mark's fault even though it is, and you are also saying that you see the problem and you will fix the problem, you are not ignoring it, while also not making facebook and mark a monster. Now that he said these things which are all true, mark will be on full force attack, try to ban or diminish all anti-trump and pro-biden things and will try to publish all anti-biden and pro-trump things.