I am working with this plugin and i really love it thanks Rodrigo! :D
So i found a miscompatibility with "SFC - Like Button" plugin, them, i think that i found a fast fix.
In the sfc-like.php file near the line 167
$excerpt = strip_tags(get_the_excerpt());
$excerpt = strip_tags(get_the_content());
Rodrigo said that one reason for the plugin doesn't work is the use of the excerpt wordpress function
I hope this help someone else,
NOTE: Sorry for my english! :P