Alot of time when going through resumes, if we try to Google the person, do a usenet lookup or other such things and can't find them anywhere, to us (when evaluating resumes), it means you are lying on your resume or have very little work experience.
If you aren't communicating, it doesn't tell me that you just aren't communicating, it tells me you have little experience.
So if you search for the name on my resume and miss the multitude of posts under my account named "sir_fix_a_lot" then I have no experience? Maybe I'm wrong, and I usually am, but I don't list the account names for all of my online forums, etc., on my resume. You have probably missed out on some pretty decent talent with that narrow-minded approach.