Not just scary because they are long numbers, but scary because they will take the user to some unknown place. If someone’s blog links to a domain I recognize,

Not just scary because they are long numbers, but scary because they will take the user to some unknown place. If someone’s blog links to a domain I recognize, I feel safe clicking it. If a blog is linking to a random IP address, it then becomes a question of how much I trust the person behind the poster, and their ability to secure their server… and the security of my own browser.