Adds the facebook like feature to the top of every dicussion.
Seems to require 2.0.16 or later
Also includes meta data facebook uses.
Currently contains a small amount of inline css to position it next to the meta information, didn't seem sense to include a whole new css file for 1 line, however can be changed if people require it for theming.
This addon is a plugin. You need to extract it to your `/plugins`` folder to install it.
Add support for image meta tag for facebook thumbnail