50% of Web users have never heard of RSS

Nielsen//NetRatings surveyed 1,000 Web users regarding their RSS usage patterns.

RSS usage and familiarity survey

Survey response %
I use feed aggregation software to monitor RSS feeds for blogs 4.9%
I use a feed aggregating Web site to monitor RSS feeds for blogs 6.4%
I’ve heard of RSS and know what it does but don?t use RSS feeds 23.0%
I’ve heard of RSS but don’t know what it does 15.7%
I’ve never heard of RSS before today 50.0%
Source: Nielsen//NetRatings