I was creating an event page for Youth For Seva's Annual Day '12 at http://rishabhsrao.github.com/yfs-ad-2012/publish/index.html and ran into a problem with Facebook's OpenGraph's
og:image:url meta tag. It appears that it can’t take relative URLs. Bummer! Others have also asked about it here and here. It has to be absolute. I’m gonna try giving a relative URL for now — no choice. Hope it gets implemented in the future.
The Facebook Like Linter Tool said,
Object Invalid Value: Object at URL 'http://rishabhsrao.github.com/yfs-ad-2012/publish/index.html' of type
profileis invalid because the given value
og:image:urlcould not be parsed as type