Ever wondered what people notice most about your Facebook profile or business page? Check out this "heat-sensing" visual to see where people look most often. The redder, the better!

This is very informative, and although consistent with site conventions (reading right to left, up and down), still really great feedback for where to focus your attentions on creating an engaging Facebook profile or page.

I think the best thing to take from this is that if your profile picture is currently a grey question mark, like this:

...you might want to change that =)