Dagney, It sounds like you're talking about the FB "Fan Page". They are the only pages that have the "like" feature...button, and yes, if it's been "liked" you will see the news feed on your profile and everyone else will see you "liked" that page on the news feed.
But what's interesting is that you didn't press the "like" button, but it happened anyway, then you "un liked" is that correct?