I was installed the AddThis plugin for Magento ver. 126.96.36.199 and Admin part is working perfectly.
It seems to be all necessary files and folders in "app" folder were created right.
I already set the AddThis Profile ID and button style and already put this string in my catalog/product/View.phtml
<?php echo $this->getLayout()->createBlock('sharingtool/share')->setBlockId('addthis_sharetool')->toHtml(); ?>
But still have no sharing knobs visible at frontend. I need help! )