Bug in 2.4.

It seems you need to escape the quotes in the og:description meta header, or you get a bit of text “dangling” at the beginning of your page.

Edit social_sharing_toolkit.php line 569 to read:

<meta property="og:description" content="' . esc_attr($excerpt) . '"/>';

(Generally good practice any time you’re dealing with excerpts or blocks of unpredictable text).

Cheers,
David.

https://wordpress.org/plugins/social-sharing-toolkit/