Yeah, but look at the design - I mean I don't have a position on this, but in my opinion it LOOKS like a Facebook button... I'm sure they didn't intend opengraph to be a landgrab of sorts.
Unfortunately it's a bit difficult to get in contact with FB.
I don't want to get into it too much because we'll ultimately see, but I'm sure if I made a "Don't like" button - they'd kick my ass. I get the feeling OpenGraph was intended for a service based business, i.e. Geoff just watched [x] on Netflix.
Best of luck tho.
Thanks Geoff!