For every social media that is down, there is always an issue beside it, no one is perfect even seun isnt, Early Nairaland years when people were spamming, Lalasticlala bought anti spamming boy, they tightened their firewall to block all XSS attack, also they further used cloudfare to Protect their website, as a Security Researcher we Discover bugs every day on Facebook, you can just go type "Facebook Bug Bounty" or " Hackerone" etc on Google, this recent board issued Facebook may have Been reported, to security audit which the Facebook staff sometimes might overlook low and upcoming researchers I've also worked for a company like that before that I discover they open their door for a thief but they were claiming he has not entered.