facebook like button only showing up when logged in -

for reason facebook button showing when logged in on site.

here link http://www.your90s.com/, , behavior repeated through out every post on site.

i'm pretty sure issue on end haven't been able figure out yet. using "really simple facebook twitter share buttons" plugin wordpress, behavior seems emulated plugin use.

any thoughts or input appreciated.

i should clarify when "it shows when logged in, mean logged in facebook"

cheers