Need help in FB groups about posting Ads

We got some questions in FB and hope u guys can help us to solve it, thank you!
1.What's the maximum of posting groups with new PVA in facebook?
2.what's the limit of groups number with old PVA in facebook? How many numbers of groups are safe?
3.Is it any good realm of facebook cannot be reminded as dangerous link?

No one can actually answer your answers, Just keep posting and see what works for you, there is no perfect number.
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thank you keep posting