javascript - Facebook share button not showing the thumbnail image? -


i'm confused. have og tags:

<!doctype html> <html class="no-js" lang="en-us"> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta property="og:image" content="http://www.chineselearnonline.com/wp-content/themes/clo/assets/img/images/clo-fb-white.png"> <meta property="og:title" content="chinese learn online | progressive mandarin course"> <meta property="og:description" content="see why thousands of students raving unique, progressive immersion method learn mandarin chinese.">

it shows fine on facebook debugger:

enter image description here

but don't see thumbnail preview:

enter image description here

what problem?

facebook button code:

  <div id="fb-root"></div>   <script>(function(d, s, id) {     var js, fjs = d.getelementsbytagname(s)[0];     if (d.getelementbyid(id)) return;     js = d.createelement(s); js.id = id;     js.src = "//connect.facebook.net/en_us/sdk.js#xfbml=1&appid=128928147210470&version=v2.0";     fjs.parentnode.insertbefore(js, fjs);   }(document, 'script', 'facebook-jssdk'));</script>   <div class="fb-share-button" data-href="http://clo2015.chineselearnonline.com/level-test/" data-type="button_count"></div>

live site:

http://www.chineselearnonline.com/level-test/

image:

enter image description here


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