The term "whataboutism" is often used (like in this case) to shield against legitimate criticism. The above poster is not claiming that FB is not bad or should not be criticized - he is saying that he thinks the media treatment of contemporary moral issues is not weighted properly. Maybe you still disagree with him, but simply calling "whataboutism" muddies the water.

Here is a great episode of Citations Needed about the term "whataboutism": https://soundcloud.com/citationsneeded/episode-66-whatabouti...