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There is no reason to panic.
@Robert, I would like to add:
If there is no message from Google in WMT about a significant rising of 404s. If so, you should look for Errors.
Mentat - "something is fubar."
We do thousands of searches in our commercial business weekly. Are seeing a lot of old old pages referring to current local events as far back as 2004 ranking, one which ranks #1!
[edited by: aakk9999 at 11:21 am (utc) on Apr 7, 2014]
How long does it take to Google to read the file and disavow links?
Yeah, but they KEEP crawling those same pages for years. I have pages that I retired in 2011, and three years later, Google bot is still looking for them.
I don't know what G has done however my SERPs, both search and image, are absolutely diabolical, this seems to have started Thursday, Friday was awful and today is heading for even worse.
I just did a three keyword search on Google.co.uk and only one UK site was returned in the top ten and another two in the top twenty the remainder were:
USA 12 sites
China 5 sites
Seriously though, what IP address was you searching from?
[edited by: aakk9999 at 3:45 pm (utc) on Apr 13, 2014]