facebook returns broken json when using callback

[skecskes]

I have found in my google webmasters tools that each post which has facebook share button with counter is blocked. The blocked url in GoogleWebTools is in this format:

http://graph.facebook.com/?id=https://github.com/darklow/social-share-kit&callback=cb_facebook_3590

So its fb graph url, then the id is website and then there is callback. The response is not blocked, but is broken json due to callback variable:

/**/ cb_facebook_3590({"id":"https:\/\/github.com\/darklow\/social-share-kit"});

Seems that facebook doesn't like callback variable name because when I change it to cb it automagically works:

http://graph.facebook.com/?id=https://github.com/darklow/social-share-kit&cb=cb_facebook_3590