You may have added them as a friend but if you visit someone's profile page and it says add friend on their profile it means they deleted you as a friend. Deleting friends is common on Facebook and most times if you have a lot of friends you won't notice it.
make a new profile
Facebook does not notify for visits to a profile. If the Facebook page is private, then a request to be a friend must be made and accepted before a visit is allowed. Only upon comment, is a visit confirmed.
If they blocked you you cannot see their profile. The only way you can see someone's profile is if your their friend on Facebook.
Im guessing that if you go to someone's profile and see them as one of your friends they are supposed to be a mutual friend
There is no function for that in Facebook, as of now.
yes
a stalker on facebook is someone who looks at your profile alot.
Unfortunately, Facebook does not have that function.
you can know if you put the mouse on someone's profile you'll read one or may be more than one mutual friends;this means that you & this persons have friends in common
No
no, they cant see anything you do, and you cant see anything they do!
To view someone's profile, click on their name! You just have to be their friend on facebook and then you can view their profile. If you don't add them as a friend then you can only see certain parts of their profile!