Although sharing buttons appear on individual blog posts, the settings>sharing dashboard menu item shows no options to customise the buttons that appear, nor the option to show them on the front page (as shown in the wordpress help page http://en.support.wordpress.com/sharing/). All I can see on the sharing menu are the options to link (i.e. autoupdate) my blog with Twitter, Yahoo etc.
My blog is totally public, btw, so it's not the privacy settings that are to blame. Any ideas?
Blog url: http://theorytestpro.wordpress.com/