In general I am really in favor, that everyone has to stand by their own actions. When someone says something, he should be held accountable for it. If someone reposts something, he should only do it, when he takes responsibility for it.
Without that system the world of trust would not work.
I am for freedom of speech. But I would not make a difference in reposting or posting. The result is two times the same. Followers probably going to see the message. So why in the world should a repost be less responsability?