Another way of thinking about it is - if the NSA wanted coca-cola's or KFC's secret recipe; They would already have it.
But social media as a whole, is for governmental security services, the greatest invention they never made.
https://www.muckrock.com/news/archives/2013/jun/21/foia-how-...
That would make an excellent title for a book for film: "An Artist Of No Repute".
I guess what matters is what data holders do with it.
If only that was what mattered. What also matters is what they're going to do with it in the future, along with what the people they're going to give it to will do with it, and what the people who steal it will do with it. (Not to mention what they're doing with it right now but not telling you).
My personal theory is that because injuries tend to heal eventually and also because they tend to physically hurt, people have a psychological tendency to underestimate the infinite future and also to underestimate anything that doesn't immediately result in physical pain.