Just comment out the code below
templates/flexible_lightmart/html/com_virtuemart/productdetails/default.php from line ~ 564
<!--
<div class="floatleft FlexibleShareItemLeft">
<!-- Twitter Button BEGIN -->
<a href="https://twitter.com/share" class="twitter-share-button" data-lang="en" data-count="none">Tweet</a>
<s cript>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="https://platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");</s cript>
<!-- Twitter Button FINISH -->
</div>
<div class="floatleft FlexibleShareItemMiddle">
<div style="width:220px; overflow:hidden;">
<!-- FACEBOOK LIKE Button XFBML BEGIN -->
<fb:like send="false" width="220" show_faces="false" colorscheme="light"></fb:like>
<!-- FACEBOOK LIKE Button XFBML END -->
</div>
</div>
-->