This isn't necessarily a good or bad thing, but the sheer number of people and crawlable public content it is an ever-growing training dataset for AI. This has potential to be dangerous.

If you are going to make that point, you must concede the equal potential for it to be the opposite of dangerous (vergy very good :P )

Boston bomber(s) witch-hunt, springs to mind. Not to mention the whole jailbait expose.