Facebook launched a revamped Insights section recently, and they're continuing to add new features to it.  The latest is the ability to see negative reactions to each wall post you make.

To access it you go into your Insights and click the number in the 'engaged users' column next to the post you wish to analyse.  It will tell you at the bottom if any users have hidden the post.

Another interesting tool if you wish to gauge the reaction to individual posts on your Facebook page.