My most useful web tool

The most prevalent, and overwhelmingly useful tool I use on the Internet is not a website, not email, not shared documents or photos or videos or music, but a "behind the scenes" bit of code: RSS feeds. First, what is RSS? RSS - Really Simple Syndication "uses a family of standard web feed formats to publish frequently updated information: blog entries, news headlines, audio, video. An RSS document (called "feed", "web feed", or "channel") includes full or summarised text, and metadata, like publishing date and author's name.  RSS feeds ...