facebook button is not sharing

I installed the plugin and it works great, except when a user wants to share on facebook, no matter if the user is logged into facebook or not, the post on facebook is not created in the user's wall. What happens? you can try it by clicking on http://www.yolyripepi.com/el-cuerpo-toma-lo-que-necesita-para-sobrevivir-el-exceso-lo-almacena-en-grasa-y-sigue-adelante/