We've been building Frontpage - a similar product for making RSS, news and social feeds all available from the Lock Screen - for a few months now. Same idea, no inputting passwords. No fumbling through multiple apps. Just easy access to your content.
Cool concept, by the way!
In answer to your question though, yes, quality is not a guarantee. Luckily Facebook has its own built in ranking system - are your friends commenting on the picture? If so, it will probably be worth viewing regardless of image quality
"This item cannot be installed in your device's country."
Google Play requires that you list the countries that you would like your app to be available in. We kept our list relatively short for our beta release, which is effectively what you're trying to download.