Are anonymous denunciations of other people's posts on social networking websites a good thing?

Facebook is facing a serious problem with trolls anonymously bringing art photos to the attention of Facebook moderators, and calling them porn. According to this article, people can anonymously target those they hate and harass them by denouncing their posts. This leads to absurd situations where a person reposts something, is denounced and censored for it, while the same photo remains up in thousands of other places on Facebook.

Facebook has made its rules deliberately vague, so they can justify any action at all, and say it is a reasonable interpretation of their rules.

What do you think of this? Is this any way to run a social networking site? Is it possible to have more freedom, or will that ruin the site for too many others? Is that the price we pay—a loss of freedom of expression in order to make other people feel comfortable? It’s not like they couldn’t go somewhere else, right?

Is that the answer? Love it or leave it?