Steve Rubel started a lively discussion about how RSS adoption
has peaked. I only somewhat agree with his assertion, and it is
because I agree with his reasoning:   The reason I disagree with
his sentiment is that RSS is not mean to be a mainstream
technology. It is meant as plumbing or infrastructure. Mark
‘Rizzn’ Hopkins tends to agree with me. He wrote a post on
Mashable where he argues that mainstream RSS use is much higher:
The truth is that it’s pretty difficult to hit a website these
days that doesn’t use RSS in some way, shape or fashion. If you
look at the average page here on Mashable, there are about two
or three sections which rely on RSS to pull in information
relevant to the readers. If you turn your attention to the most
popular sites on the web, sites like Facebook, MySpace and
Google all have syndicated content strewn all through them.  All
of the web sites he mentions use RSS for various reasons.
Facebook uses RSS feeds to display its “Live Feed”. Google has
RSS all throughout its products.