Ok there are three problems.
1: The facebook button has been checked to be shown, but in actual it is not shown.
2: After clicking to tweet, the number wasn't increased but stayed at ZERO.
3: After clicking the Google+ button, the little window popped up just for a split of a second, then just vanished, Google+ became a red '! triangle".
Basically the plugin doesn't work at all. Please let me know what is wrong with my wordpress. I only have SEO by Yoast, WooCommerce, Regenerate Thumbnails, Watermark RELOADED plugins installed. Please help. I will wait for the answer before I go to bed.