Facebook plugins? —That dont require "api key"

I’ve hunted for a user-friendly facebook comments plugin that can be added easily to any page or post, but they ALL seem to require an api key, which are only available to you if you have a facebook application. When I try to plug in facebook’s api in the html, it works UNTIL I make any edits on the “visual” edit tab, then the html gets deleted. I’m hoping to not work with a widget, I’m looking for something I can easily add in the text or code on the editing page for any post.

Thanks!