Great guide from KissMetrics blog, about how to market your startup (or other miscellaneous website) on Reddit.
If your website content tends to be more progressive, unique, curious or simply eye-candy, there's a strong chance it will do well on Reddit. All social media sharing sites have their own underlying pulse - and if you can tap into that by posting relevant content, you'll be rewarded with a massive boost in traffic. Remember that here, people are actively looking for something that piques their interest. Tailor your posts to meet that urge head-on, and you'll start reaping heaps of traffic.
Worth reading the whole article and, of course, experimenting!