I don't see exactly how this is a violation of privacy, since the same friends that see your advertisements can go to your About page and get that same information from your list of likes.
But its not. Its viewable to your friends only (who may be browsing a third party site). This information is not made public in any meaningful sense of the word public. Only those who were able to see your like on facebook will ever see it in the context of an advertisement. Hence, no privacy violation.