Facebook widget not showing on the side bar

Hi,
I was trying to install the facebook Widget on the side bar of the home page but it doesnt show anything except the heading , this is code copied from Iframe of the facebook page.

Even when i am facebook developer page and put my facebook URL, it doesnt show my facebook profile under the perview.

<iframe src=”//www.facebook.com/plugins/likebox.php?href=https%3A%2F%2Fwww.facebook.com%2Fpsp74&width=300&height=290&colorscheme=light&show_faces=true&header=true&stream=false&show_border=true” scrolling=”no” frameborder=”0″ style=”border:none; overflow:hidden; width:300px; height:290px;” allowTransparency=”true”></iframe>.

Please help.