What this '+' stands for

It stands for those who are considered "friends." If you look on your profile page you will see the list of those you have befriended, and those people are noted elsewhere by the "+" sign.
I used to think it marked people with special priviledges that I did not have. I was right.
I don't understand what you meant by this..

They are trying to get close to you so they can kill you haha!!:eek::D

Methinks that's what friends are for: to strangle you in your sleep.

That is why one must be careful of the company one keeps. You can't trust anyone......