You can report articles, forum posts, and questions as spam. It is quite easy to do, and I absolutely report all three of those types of content here when I see what I know to be spam.
Look at your own question, do you see the flag icon underneath the facebook, pinterest, and email icons? You click that flag, and I am sure you can figure the rest of it out from there.
You can also report things for being ridiculously poor quality, or for violating terms of service in other ways, like for being pornographic or otherwise inappropriate, or not in English.