They take it into their own hands to administer justice. You become concerned that employers, friends and family members will see the accusation if they search for your name.
So, if you're angry at someone, you can achieve a form of vigilante justice by publishing negative information about them and sharing it with many people - even if your account appears to be factual and not sensational.
You'll see people attempting to take justice into their own hands if you look at the comments below the author's post.