Scamsters are spreading rogue applications to Facebook users. They pretend to offer you the ability to see who has been viewing your profile or count how many views your profile has received. The onus is on Facebook users to be smarter about which links they click on. When I followed one of the links from a Facebook test account I created, it took me to a page which tried to lure me with the offer of a white iPhone. All I had to do was enter my mobile phone number (and thus sign myself up for signing myself up to read more in this article.”]
Source: https://grahamcluley.com/white-iphone-facebook-views-beware-links-rogue-apps-spread-virally/