It seems to be working reasonable well now. Run your site through https://developers.facebook.com/tools/debug/ and you might have to hit “Fetch new scrape information” after you run it if “Time Scraped” is too old on the report.
Of note in the report at the moment:
og:image was not defined, could not be downloaded or was not big enough. Please define a chosen image using the og:image metatag, and use an image that’s at least 200x200px and is accessible from Facebook. Image ‘https://pissingpploff.com/wp-content/uploads/2014/10/Pissing_people_off1.png’ will be used instead.
Personally, I’m still having to fight through at least three pop-up modal ads on your site just to get to it in the first place, which is pretty much what Facebook is seeing too.
Limiting the pop-up ads which hijack the browser window until closed (thus preventing Facebook from seeing much of your site) will help, as will installing a plugin or using a theme which providers OpenGraph support.