I have written before about the value of Facebook's homepage for logged out users: both from a promotional (huge lift for Facebook; both Facebook + Twitter do it) and advertising perspective (eBay example). Last week Fab ran a great ad placement for logged out Facebook users. No doubt he got significant reach and is effective because Fab does such a great job with social shopping / Facebook integration. However, it is still a strange concept to see - and market against - "everyone who logs out of Facebook today sees our branding."