Browse your local Meetup groups. Definitely look on Google+. Github has contact info for many folks but is hard to search. Few people know that it allows resume search via its API. To access resumes, hire a coder or use TalentBin. Try http://stackoverflow.com/users. Look for specific mailing lists, forums, yahoo and Google groups. The logos above give you an idea of what those places can be about.If all else fails please give us a call at Brain Gain Recruiting!