Is everyone with the same last name related?

Question:

Is everyone with the same last name related?

if so, is there a site where youcan find all your distant relatives?

Best Answer - Chosen by Asker: It is rare that everyone with the same name is related, although it does happen once in a great while. You can stop at a place like genforum (or others) where they have surname sections. All will be searching the same name, but at the same time, working to distinguish which are from what core family.
Here is a tip... just starting in research, the standard advice is work from yourself backwards. In your immediate family, you KNOW (and verify) those relatives. Next, to the grandparents, and their children.. thus you insure those are related. You continue the process, one generation at a time. As you go, it focuses on the desc. of John Smith and Mary Jones, of (say) Missouri. You look mainly at the Smiths in that immediate area, instead of what I call "throwing darts" at any one with the Smith name, and hoping they are connected.
My other personal tip is to shift the thinking from ANY one site as being where you will find all the information. Look at it as a combination of thousands of tiny facts, but interconnected. These facts are all over the net.. the more sites you find, the more luck you have. And it isn't all online, either.
Come on in, the waters fine.