They sure are.
For example, I searched for one of my websites using all small letters using two distinct words, that should have matched the site. Guess what, my site did not even appear once in the list of results across four major search engines.
Then I capitalized each word, the results changed and bingo I had 3 direct site referrals out of the top 20.
Then I searched both words as one word with the CAPS in for each word, the results changed again with more result.
Then I searched both words as one word with no caps and the results were amazingly 9 out of the top thirty-five links displayed referred back to my sites.
Yes I have more than one site and some sites refer to the site I was looking for, but thats the way it is supposed to be.
Then lastly, I searched for my original two words using all small letters and guess what! Now I see the same list I just searched for in the previous (4th) search.
It is strange that at first nothing was in my search results list and then after doing three different searches with the same wording, just typed differently, I get more of what I was looking for.
The strangest part is the same search terms that initially provided nothing on the first search all of sudden provides everything when used as the fifth and final search.
Hmmmm…..I wonder if I deleted my browsers cache (Mozilla FireFox), would I get the same statistical results? What if I delete all the cookies, too? Would IE browser act differently? What about the Opera browser? Oh, who cares, the content is out there and that is all that matters right now!