I have been removed from the google index as of Dec 20-23 sometime. Our site is over 4 years old (had a PR of 4)and I have no idea why. I've been doing everything I can to address and remedy the issue, so far without any luck. I can across this tool in the posts: [google.com...]
I used it but am unsure what to see. Everything seems normal expect that google last visited my site on Dec 20th. Please help
The tool's main purpose is to show if a domain is known to have served up malware - that's the main point of it, rather than a spidering report. If a site is found to serve or even have a relationship to malware, that's often a reason for a ranking drop or even removal.
For a few domains that I just checked, the last visited information that the tool shows is much earlier than what the server logs show for googlebot visits -- it's also earlier than what Webmaster Tools says, for that matter. So I'm currently thinking that Google uses a dedicated bot to check for malware, and only that bot's visits are being reported by the Safe Browsing tool.
[edited by: tedster at 7:31 pm (utc) on Jan. 9, 2009]