I actually discovered wptavern via reddit.

In late Jan/early Feb I posted some articles (images really, from my WP powered art gallery/archive). During the week I performed "the reddit experiment" I experienced a huge uptick in traffic. My site is quite niche and generally does around 100 visitors a day, but I got around 800 to 1000 per day which then slowly tapered off over Feb.

Based on my experiment, Redditors (as the hardcore users call themselves) are a fickle bunch, but if you can grab their attention with good content targeted to smaller niche subreddits you will get the traffic. I found with the larger subs, if your post gets a few downvotes early it will be buried under new content and then no click-throughs.