When I used Facebook's Debugger (Linter) to peek at how Facebook parses the advanced OpenGraph data I'd included, I was greeted by errors like:

Transcript

Hi. This is Joshua Stewardson of Covenant Web Design. And I want to explain today how to create a Facebook ad and what is so powerful about these ads as opposed to other forms of online advertising.

Facebook profile pictures - your own or your company's - are put in the top left with the top portion overlapping a grey background.  This works fine for the average profile picture of a smiling face:

However, if the profile picture has a white background - like a company logo - it starts looking blocky.