Thumbnail for tag archive

Hello,

I want the tag archives to pick up the image i have set for ‘default thumbnail plus’. I have selected a particular image (lets call it A) in the plugin settings as default image for ‘any’.

The only checkbox selected in settings is ‘use image attachment if available’. Both other check boxes are not selected (i.e. ‘Use embedded image if available’ and ‘Use embedded video thumbnail if available’ are not checked).

The tag page has an image showing in sidebar. When the page is shared on facebook, the image appearing on page is selected as thumbnail and ‘default thumbnail plus’ image (A) is not selected.

I want the plugin image to be shown and not the one present on page to be used as thumbnail.

The website is http://www.funinfinite.com and tag archive in question is http://www.funinfinite.com/tag/urdu-jokes/

Please suggest what i am doing wrong or what i additionally need to do.

http://wordpress.org/extend/plugins/default-thumbnail-plus/