Finding adopted siblings via internet?

My parents have always been very open about the fact that I was adopted, and I was aware of the fact since I was one year old...however, what my parents and I did not learn until much later was that I have biological siblings. Having been raised as a single child this came as a bit of shock to me (my face was like this O.o) but now I realize that I would really love to meet my kin. Don't get me wrong, I love my family and am very grateful to my parents, but I would also really love to meet my siblings too :).
Unfortunately I have very little information on them- I'm not even sure how many there are (two for certain). I know that the eldest of my siblings was adopted (as I was). We think his name is Drew and we think that he is now living in Colorado- we know for certain that he was born in Chicago (like me) and that he is deaf (not sure if completely or not). He should be about eighteen now (if my math is right). I don't know if he knows that he was adopted, so he might not be looking for me....
We have little to no information on the rest of my siblings as they were born much later (they would be around 14 at oldest now) and I do not have nor wish to have contact with my BP (birth parents). They may be half-siblings even, but I would still love to meet them.

I was born with the name Vicky Lee _________ but it was soon changed. I am twenty years old now and live in Illinois (born in a Chicago hospital- I forget which one but I'm sure it's on my birth certificate). I know my parents know my birth name's last name, but I'd rather not know it myself unless it proves vital to the search (personal reasons...). I also do not want to contact my birth parents (for information or otherwise).

Needless to say, I don't got a lot to go on :) but I'm gonna try. So, can anyone suggest a good site to try to find my oldest brother (I sadly admit that with my limited information there's not much hope for finding the others :( at least not now...)? The fact that he's deaf or at least hearing-impaired is my biggest clue but unfortunately most of the adoption sites I've visited don't allow that type of entry in their search engines. I was even thinking of searching MySpace for hearing-impaired groups but I have no clue how to do that (yes, I am that one person on Earth who still hasn't been there yet ;).

Any thoughts or ideas are appreciated, thank you! :)
 
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