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"For more info, see this related post: Google Reader Stats are Bullshit (With Proof)\nLast Monday I noticed a major issue with Mashable's Feedburner stats: a service called ActiveWeave Blogrovr was reporting 30-35K extra readers to our feed.  It was also reporting four times the \"normal\" number of subs for Mashable France.  I'd noticed ups and downs of up to 50K subs on other blogs too.  Further investigation suggests that this is one of many, many RSS overcount issues, most of which are caused by something called \"default feeds\".\nThe boost wasn't unique to us: in fact it applies to many large blogs.  I spoke to another tech blogger (who wishes to remain nameless), who explained that his stats sometimes see a 35K increase thanks to BlogRovr's default feeds.  This is a blog that normally has around 2K subs.   \nThe problem is that the sub numbers probably aren't real: suspecting foul play, we asked to have our blogs (Mashable, Mashable France) removed from the defaults in the middle of last week.  Literally overnight, our numbers dropped from 160K to 125K, and they're still settling.  If you lose 35K \"readers\" simply by being removed from the default feed list, you never had those subscribers in the first place.  Neither I nor Feedburner know the exact nature of BlogRovr's overcounts and to what degree default feeds have skewed the stats, but we know there are continuing problems.  It may also be the case that BlogRovr reports weird stats for all the feeds you add, and it just applies more to the defaults or popular feeds.  Feed counts that vary by plus or minus 30K subs are possibly affected.\n"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2007/10/15/activeweave-blogrovr-screwy-feedburner-stats/>