Hey Brankica, These are some great sources to get more traffic to your sites. I do agree with your arguments about answer sites and forums. Most of us, including myself, don't use these much, nowadays. I clearly don't know the reason. But I can tell you one thing : Some forums ban you if you promote your site (that depends upon what type of forum it is). Anyway, thank you for sharing the great resource ! And Best of luck with the contest :D I think you would probably win the contest :D (because you have useful posts). Jeevan Jacob John
Referral means people clicked on a link somewhere else. This can be email or social, but is mostly links on other websites. If you switch the view in the Channels pie chart to Sources/Mediums, as we did for the screenshot below, you can see your most important links. For our lab site, Pinterest is major, as are Google’s educators’ sites and several homeschool sites. We can click on Acquisitions> Referrals to see more. Referral traffic can be a little confusing because it overlaps with Email and Social; more on that later.

I just joined digg a few minutes ago. I gotta tell you that I have been researching on this topic for several months now. By far the best article I have come across on traffic generation. It's one of the most comprehensive ones I've read. And includes a variety of sources which never struck me before. I'm a musician and I plan on starting a blog and uploading videos soon. This is really going to help me a lot and I'm gonna follow. :) I really like the idea of using sites like wiki, about.com, scribd etc...

Now, there's one more little group that might fall into direct traffic -- it's something you might have heard about as "Dark Social" if you've been staying up to date on, well, dark social as a referral source. Basically, dark social is what some people are calling the social site traffic that most analytics programs can't capture since it lacks referral data, but is coming from things like emails and instant messengers (which, technically, are social mechanisms). Often, this unidentifiable traffic -- anything without a referring URL -- is also bucketed into direct traffic. Now, as BuzzFeed so eloquently puts it, "all 'dark social' traffic is direct traffic, but not all direct traffic is dark social."
Beyond organic and direct traffic, you must understand the difference between all of your traffic sources and how traffic is classified. Most web analytics platforms, like Google Analytics, utilize an algorithm and flow chart based on the referring website or parameters set within the URL that determine the source of traffic. Here is a breakdown of all sources: