It's fiction. Yes, inspired by a true story but fiction nonetheless.
You wouldn't base your knowledge about Nikola Tesla on "The Prestige", would you?
I guess you're saying "don't trust movies" and/or "Facebook would never exploit human psychology, that's a made-up fiction." Har har, good one.
Regardless, "fiction inspired by a true story" would presumably have some true elements and some not-true elements. If they were all not-true elements, it would be completely made-up, literally 100% fiction (not based on or inspired by a true story), and anyway I don't think there's any such thing as 100% fiction, no matter how hard people try. Every fiction owes something to the reality it was concocted in.
Therefore the problem becomes knowing which elements are true (facts) and which are not-true (fiction).