This "hack" will not grant you access to the targets login details, however it will allow you to update their status. Firstly you need to do a little bit of social engineering and get something from the target. This is what you need to do.
What i have covered is an email address. Everyone has a different email address. What your job is, is to get the target to tell you their unique email. I did it here:
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Now that you have it, go to your hotmail and click "new" for the "to" box put in their unique email.
Now, the "subject" of the message is going to be their status update. like this:
haha. Now if the person changes their passwords you'd have to get them to give you another email which could be tricky. But as long as their passwords stay the same you can update their status' all you like I had a little too much fun
Is their e-mail associated with their "username" (not real name) on Facebook? If so you shouldn't have to do any social engineering, would be cool if someone found out exactly how they are made, I mean the e-mails.