Recently there has been a lot of talk about Facebook versus Twitter and which is more valuable to web publishers. If you’re looking for the short answer, IMHO it’s Facebook; but, to understand why, you need to have deeper understanding of how each system works.
One of the key aspects of Twitter’s meteoric rise was a very low barrier to entry: basically all you needed was a working email address. This is also one of Twitter’s drawbacks, making it extremely easy for one person to create and manage more than one Twitter account. If you’ve ever gotten a robo-tweet