Given the date of the post, the content and that it happened with delay, I am quite sure his friends who disagreed with him politically reported it as a spam.

Given the date of the post, the content and that it happened with delay, I am quite sure his friends who disagreed with him politically reported it as a spam. Perhaps after certain number of people report it, it automatically will be marked as one (such logic would be more reliable on FB, than for example reddit or HN, since most FB users have a single profile tied using their real name)