I'm trying to share some content's on facebook but i have a lot of problems. i've add the correct keyhash, and created the app on facebook and put it live. When i try to share something it seems good as you can see:

But after i've clicked on post it's empty:

It's a permission problem? i've read a lot about this on stack but i can't find an answer that works... That's the code :
public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) 
        {
            case R.id.action_share:         
                Intent intent2=new Intent(Intent.ACTION_SEND);
                intent2.setType("text/plain");
                intent2.putExtra(Intent.EXTRA_TEXT,"'"+ random + "'" + "\n"+"By Random Quotes"); 
                startActivity(Intent.createChooser(intent2, "Share via"));
                break;
                case R.id.randombut:
                     Frasi();
                case android.R.id.home:
                    Intent homeIntent = new Intent(this, MainActivity.class);
                    homeIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    startActivity(homeIntent);
                break;
                case R.id.facebook:
                    FacebookDialog shareDialog = new FacebookDialog.ShareDialogBuilder(this)
                    .setApplicationName("Random Quotes")
                    .setDescription(random)
                .setPicture("https://lh6.ggpht.com/1UJ89ho9pvVLPYS6NsFVQdb7KoQPALMhkw1w7DnNDqcfDYJ-tRxruaf2YLMLyqhnG_g=w300-rw")
                    .setLink("https://play.google.com/store/apps/details?id=com.techappstudios.randomquotes")
                    .build();
                    uiHelper.trackPendingDialogCall(shareDialog.present());
         }
        return true;
    }