Are Google and Yahoo Inflating Results?

David Sifry, CEO of Technorati, is calling out Google and Yahoo to explain why their reported results are sometimes much larger than their viewable results.

Can someone from Google or Yahoo help me to understand why their reported results are sometimes 1000 times larger than their viewable results? I look forward to being educated.

This comes as a response to Tristan Louis’s comparisons between Google, Yahoo, and Technorati’s results.

Update: Danny Sullivan and Tristan Louis talk about Link Counts, Site Counts & Index Auditing.