Blog Ping
Many blog authoring tools automatically ping one or more servers each time the blogger creates a new post (or updates an old one.) That is, the tool sends an XML-RPC signal to one or more “ping servers,” which can then generate a list of blogs that have new material.
Open ping servers, like VeriSign’s Weblogs.com and Yahoo!’s blo.gs, let other web-services subscribe to a list of blogs that have recently pinged them. Blog search engines can provide fresh results very quickly by polling only the newly-updated blogs. Similarly, aggregators use results from ping servers to tell subscribers which items on their subscription lists have fresh material. A few of the blog aggregators that can be pinged directly include: BulkFeeds, FeedBurner, Google Blog Search, IceRocket, Technorati, and Yahoo
In addition to open ping servers, there are an increasing number of proprietary ping servers that gather information only for their own applications. Most of the major blog search engines operate such ping servers.
