the facebook linter says, that my Website uses a thumbnail which is too small:
og:image should be larger:
Provided og:image is not big enough. Please use an image that's at least 200x200 px. Image 'http://stura.hft-leipzig.de/wp-content/uploads/2013/05/IMG_5927-300x200.jpg' will be used instead.
the plugin uses the 150*150 px picture.
this issue should be solved in a new release.
the whole debug can be found here: