Installation is very simple: download the plugin, unzip it and drop it in your plugin folder. Follow the instructions provided in the README.txt and you are set.
- You need to enter your Facebook ID in the plugin settings. Here is how you find it.
- In the plugin settings you can define the width of the button in pixels. You need to put 'px' behind the number though, or it will ignore your setting and use the default width.
One tiny bug (I think). In the current version (0.2) you can opt to use the text 'Recommend' on the button instead of 'Like'. But for me, this setting didn't seem to do anything, even after republishing.
If I have some time I might dive into the code and have a look.