Re: Sorry, this is sad news.
I didn't think their content moderators worked out of FB's head office. Thought they were contractors in cubes in cheaper locations.
I don't expect FB to be a great employer, given how they treat their customers, and yes, I've heard the horror stories about how the moderators are not well supported. There's nothing to suggest this person took their own life due to personal reasons or work reasons and seems unfair to speculate when nothing is known.