I think that you'd be hard pressed to make the argument that the Facebook platform itself, not just the management, is a purely net negative influence on society. Perhaps its original form, where people simply connect with their friends and share updates and photos, is, on paper fine, but it hasn't really resembled anything like that. It is entirely engineered around hacking people's attention spans in order to push advertising, and the methods it uses for doing so involve intense data collection and destroying user privacy. It has greatly contributed to the breakdown of political discourse in the US and around the world and by nature of its construction promotes extreme views and hyperbolic clickbait. The same criticism applies to Twitter.
You can at least make some kind of defense of the products and services that Amazon, Microsoft, and Apple provide. Probably Google as well, though perhaps their case is weaker. But in my opinion, there isn't a defense to be made at this point regarding the virtue of Facebook or Twitter, neither as corporations, nor as platforms. The world is worse off because of their existence.