Do you add people who you doesn't know in your YAHOO! Mesengger list????

As we all know, Yahoo!Messenger or YM is one of the most popular instant messenger (IM) nowadays. By using Ym, we can chat and even talk with our frinds or family members. Is so easy what what is most important is FREE! So, what I want to discuss here is, are you like anyone who you doesn't even know in your ym list? For me, only add people who only i known. This because sometimes, there are people who just playing around and sent junk offline or online message to us. Are you agree with me? Or some of you may have your own opinions. Let's discuss here. Give your opinion now. Be open-minded.