You (and your parent comment) said “make the world a better place”, not “change” it. Very few things change the world meaningfully.

And the point stands: what he did was more relevant than most (if not all) Facebook communities will ever accomplish.

He very literally did change the world. There wasn’t a forest there and now there is. In fact the conception of “the world” as an abstract global concept is much less impactful than what people see outside their window and in their city/community.