Poor people have me, rich people need me, and if you eat me, you will die. What am I?

Up I go, and your post gains fame, A tiny click, a big online claim. I'm not a comment, a share, nor a save, But I show I like it, and help it behave.

I am a man's name, and also an assassin's target. Use a sharpie to make me last forever.

I can be used as a weapon to whack you in the knee, or exclusive and very fancy. A place you can go to be wild and free, with bottle service and dancing with glee.

I have a head but no brain. I have a tail but no body. People come to me when indecisive. I jump at the opportunity to help you make a choice.