It should be ok to describe your research informally and ask if anyone is interested in participating. We haven't seen a large number of requests on this board and so aren't sick of them yet.
In my city, on the other hand, there is a university offering some sort of degree in psychology or counseling, and the candidates have to do research. They often post on a local autism e-newsletter that comes out 2-3 times a week. If I see one more request for a survey on "how autism impacts family members" from them I think I will scream! It's the lack of originality and that they aren't studying anything that I think would actually be useful for helping kids with ASD that gets to me. (Sorry if that is the topic of your research!)
What I'd really love to see is a PhD student come on here and ask for suggestions of research topics. I bet we parents could recommend a few interesting ideas! Here's mine -- someone should develop something similar to the M-CHAT, but aimed at kids who are 3-6 years old, and on the mild end of the spectrum.