It means they have customized their privacy settings so you can't see anything they do on facebook, but you are still one of their facebook friends.
No, unless you can get access to the persons account, you cant see their messages, unless that person posts it.
The average facebook user has about 120 friends.
I think Lady Gaga is person who has the highest friends in Facebook
they are not alerted, but if they go to their friends list it will say "you are no longer friends with this person."
According to the Facebook Data Team, the average person usually has 120 friends.
You just have to add each other as Facebook friends then go to the my mafia tab on the game and find the person and add them. Then after they will have to add you so you are in eachothers mafias.
80,000,000
If you are signed out of facebook and can still view that person's page, it is a public page.
If someone is sending you messages on Facebook and you cannot reply, the reason is because the person has that certain settings on their account so that only people on their friends' list can message them.
Your mutual friend on facebook is a one of your friends other friends. If you have 2 mutual friends, it means two of your friends are friends with this one person whom you are not
A mutual friend in facebook is the friends that you and the person have in common. To get more you could try adding more of their friends :P
No