I think that RSS solves a different problem (namely, syndication) than del.icio.us, and, more recently, FB, Twitter, Reddit, etc. (namely, content discovery).

I think that RSS solves a different problem (namely, syndication) than del.icio.us, and, more recently, FB, Twitter, Reddit, etc. (namely, content discovery). I do agree that the end-user usefulness of something like RSS may have been overstated, but RSS remains a useful tool in some contexts. For example, most (all?) Android/iOS news widgets make use of RSS. Google News also makes use of RSS. I'm sure there are many such examples.