Usually, there are about 1000 visits to my web site every day from Google search engine, but I noticed that it was dropped extremely since 12pm yesterday and there are only <100 visits after then. Anybody had this similar experience before?
Yes you have to keep an eye out over the next few days and then see how it goes. Check your referral logs and see if you have had any pages de indexed. Get more fresh links and fresh content...oh and by the way do you have sitemap. If not get one fast.
I have had Google go through cycles where they are visiting hundred or thousands of times a day and then falls off to 50 visits a day only to return to the higher level again a week or two later.
This could be normal traffic fluctuations that we all get i have had similar drops before but not too sure why that is and normal service is resumed anyway a day or two later.