google bug on robots.txt?

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Hi all,

a few days ago i added a robots.txt to several sites... the useragent was a
specific annoying robot (but not googlebot and there was no * in the whole
page)...  it seems that 80% of the sites just dropped like a rock (many not
found in first 15 pages when they used to be on the 1st page) about 2 days
after... (i noticed this today)...

soo... has anyone noticed this before? it seems quite coincidental to me....
i just removed the robots.txt file from all sites and now will wait to see
if they come back up... is it a fluke not related to robots.txt? or i guess
it can be a permanent change? we shall see...

but i am wondering if anyone has ever seen this?


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