It was an extreme example hopefully it wouldn’t happen, BUT if it did at least his G’ma, G’pa, aunts, uncles and cousins who are friends with him would at least know his choice of condoms.

Which would inevitably lead to the call from them to me letting me know what my son is up to which then leads me to explain a bunch of non transparent FB rules to non technical people.

Perhaps because it had a funny video or animation, or because he could win an iPad by 'liking' it. These techniques are in widespread use in Facebook advertising, and frequently targets younger people.