Facebook has not yet developed a way for people to tell who views their profile. However, some Facebook users subscribe to third party software or programs that promise to reveal profile viewers.
When subscribing to a third party program that promises to reveal profile viewers, it is important to keep in mind that Facebook does not endorse any. Many people who use such programs fall victim to malware and spyware which may cause complications to their accounts. It is always a good idea to use Facebook's help center to ask questions and find answers to contemporary issues that pertain to the site.