Services provided to publishers include
traffic analysis and an optional advertising system. Though it initially was not clear whether advertising would be well-suited to the RSS format, authors now choose to include advertising in two-thirds of FeedBurner's feeds. Users can find out how many people have subscribed to their feeds and with what service/program they subscribed. Feedburner replaces an ordinary
RSS feed by a modified feed; the original feed becomes a private feed that only Feedburner can access. Apart from advertising, published feeds are modified in several ways, including automatic links to
Digg and
del.icio.us, and "splicing" information from multiple feeds. FeedBurner originally offered
application programming interfaces (
APIs) to allow other software to interact with it, but as of October 2012 no longer does. As of August 4, 2008 (the last time statistics were released), FeedBurner hosted 1,993,406 feeds for 1,125,264 publishers, including 249,728 podcast and
videocast feeds. ==History==