Purposefully posting things about yourself isn't doxxing, nor is linking to a post of somebody posting personal information about themselves. They publicly posted it, they're fine with it being public.
OK but I still think it's creepy to track a list of what people have said about themselves.
It's a collection of interesting anecdotes. Most people are flattered when others find their anecdotes interesting.
I think you've just described all social media. :)