Facepile url

Hi,
I basically want to use the Facepile feature, but haven’t a clue as to what to enter into the facepile url. I would assume it is more than just my home page url. I checked the Facepile developer’s page which lists an “action parameter”, but that’s confusing too. Please help.

Thanks!

http://ww.wp.xz.cn/extend/plugins/social-glutton/