Two main features - a really nice guide that shows who visited my profile and also who removed me from friends. Just log in to your facebook and that's it! Check all the information with few clicks! It's free and you don't have to pay to see the information, you don't have to share or anything.
2 in 1:
1. Who visited, opened, checked, spying my fb profile, who is my stalker, who has a crush on me.
2. Who unfriended me, who removed me from friends, who deleted me.