plugin for what? wp? or do u mean from your browser or something else?
if wp..which i guess u do mean:
i think
http://www.nextscripts.com/social-ne...for-wordpress/ will do it. i only use it for tumblr and twitter really but itll embed the image (most posters dont)
" Facebook – Autopost to your profile, business page, community page, or Facebook group page. Ability to attach your blogpost to Facebook post. Ability to make “Image” posts."