Facebook scams

Like what i am about to post, i see people post this and other things all the time, what i do not get is why do people not get it is a scam
"I know a lot of you from before Facebook existed, so I care about you or I would not have requested you for a friend. I'm doing this once and once only, so now's your chance.... It occurs to me that for each and every one of you on my friends list, I catch myself looking at your pictures, sharing jokes and news, as well as support during good and bad times. I am also happy to have you among my friends. We will see who will take the time to read this message until the end. If you appreciate your friends from all over the world, go ahead and copy this into your status too, even if it's just for a minute. I'm going to be watching to see who takes care of the friendship, just like me. Thank you all for being a part of my life. Copy and paste please; don't "share." If no one reads my wall, this should be a short experiment. This is a Facebook game to see who reads and who just scrolls. So, if you read this, leave one word on how we met. Only one word, then copy this to your wall so I can leave a word"

There is other ones even more dum where it asks you to change settings but the laugh is changing them settings makes no difference when i see one of them again i will post how you actually do those settings