One good way to start would be to add the url/details in this post as well. Next, as suggested in other comments Reddit is nice, then Quora is also big hangout for many of your target audience (at least in India). Would probably need more details on the product to suggest anything more specific. If you are willing to spend some money, make a fb page and get some fb ads with product details, beta tester incentives and target to specific universities/colleges/companies perhaps...