Hi Jay:
I don't know exactly the code, but one solution will be to store the articles in a database (it will be helpfull too for a small content manager), then, in the link, you pass a parameter, say, ?article_id=XX and open a form where you fill your friend's name and email. Then, construct the message and send it via mail() function.
I know this wasn't the best reply you could receive, but, if you like my idea, let me know, and I will code something, ok??
bye
inkel