facebook and twitter missing from chrome browser version|Tweet Like Plusone and Share Plugin|Plugin Support Forum|TECHXT

if you view the bottom of the content area on this page, or any page of the site for that matter, in Chrome, you'll just see Google+ and LinkedIn sharing buttons. 

But if you view the site in firefox, safari or IE, you'll see all the buttons I selected.

So what's wrong with chrome and how do I fix? Please advise. Thanks in advance!