I'd probably be a little careful about submitting that information as well. If it's a recruiting firm, they're likely going to use it for compiling demographic information that they will then use for their personal marketing purposes. I had to sue a company a long time ago for finding my resume and altering it to make it looked like I worked for them. They then used it to pitch to clients. A lot of ruthless companies out there.
But I agree with what yowalabi said. It can often be a waste of time. It's better if you take some initiative to try and find more about the position and just seek them out yourself.