So according to this article Facebook is serving 3 Billion ‘Like’ buttons a day. Don’t get me wrong, Facebook did a smart thing launching the like button. It spreads its seed across the web because it’s obviously much easier to like something than it is to be a fan of something. I might admit to the fact that part of me likes prancing about to a bit of Culture Club, but I wouldn’t call myself a fan. It requires less commitment.
From friend to friend it works, but from a brand’s point of view I think I kind of preferred fan as a benchmark, it made you work harder. ‘Like’ lowers the standards (which are already often low), resulting in the interaction being weaker and inflating the numbers. I’d go even as far as saying it’s the closet equivalent of some sort of standard volume metric in social.

You make a good point. As things become more brief, communication ceases.
I think you summarised it far more eloquently than I!