* Asymmetric black hat research (see below) and/or StuxNet level competent
1/N
- Most social media companies aren't yet competent at blocking even obvious issues let alone adversarial
- There's little to no transparency for good actors (researchers, journalists, ...)
- Profit motives above all
en.wikipedia.org/wiki/Red_team#…
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The answer is likely zero for both practical and ethical reasons.
"(a) Asymmetric black hat research _and/or_ (b) StuxNet level competent"
Even without any (b) level competence, script kiddies (especially financed + motivated by a nation state) could well have found an easily exploited loophole by (a).