Last Saturday, there was a gasp of collective horror in the blogosphere as FeedBurner subscriber stats plunged for many sites. Today, it's happened again. Don't panic! Your subscribers are probably all still there, with Google Reader to blame for the missing numbers. Below, our comprehensive guide to how FeedBurner compiles subscriber stats explains all, today's glitch and why those occasional plunges happen.

Last weekend's drop of Feedburner subscriber numbers by as much as half was a temporary glitch. Google Reader didn't report figures, and all was back to normal the next day. Today's drop appears to be the same issue. Joost de Valk for example notes how Google FeedFetcher stats (which report combined Google Reader/iGoogle subscribers) are missing. I see the same.

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