The world of Facebook seems to be a fairly simple concept to follow. However, from time to time we are all left wondering why all of a sudden we can’t comment or like something that has been posted by our friends on Facebook. Why is that? Apparently, there are a variety of reasons why this is happening. Sometimes, without your knowledge, a person will completely disable comments and likes on something that they post. There is an option on anything that you post on Facebook that allows you to make the post private or limit comments. If you limit comments or only allow for certain people to post comments, no one will be able to leave a comment on that particular post. This could be the reason that you are finding it difficult to leave a comment on a friends post. There is also the possibility that a person has unfriended you. By doing this, you are typically not allowed to post comments on their posts unless they mark them as public. There are a variety of other technical reasons that you may not be able to leave comments on Facebook, but check the most obvious such as a person unfriending you or the privacy of the commenting option.