Question
Linkedin and Google seem to be the best avenues right now. Twitter, Pinterest, etc. do not seem like the right venue to market for us but I am open to suggestions.
Answer
LinkedIn is a very good place for B2B marketing. If you are not getting the conversion you want there could be a couple of things wrong: The audience you are Targeting, your copy or even the landing page. Facebook may be another route but I think with the technology element you are likely to get some pretty good results from LinkedIn