A website of mine has 33 urls submitted to google and yesterday my "URLs in Web Index" showed as 33. I have signed in to webmaster tools to find that it has dropped to 0. I have no idea why. Can anyone explain why this would be? I havn't done anything that would get me penalised.
google anti spam new technology now is running many duplicated content is gona be deleted by this technology only sites with unique content will get full urls index
I had this situation before, sometimes webmaster tools updates or just has a glitch, mine did come back to normal in a few days. If inside webmaster tool, you don't have duplicate issues, then just wait.
for more reference visit http://sites.google.com/site/webmasterhelpforum/en/faq--crawling--indexing---ranking