The top five leaders in paid traffic (Google Adwords) are the same companies that lead in search, with Amazon again on top. Leading retailers don’t want to put all their eggs in one basket, and they are willing to invest heavily in pay-per-click campaigns. Clearly, PPC has worked for them because we see four out of the top five spenders are the leaders in annual sales numbers.
Selecting “All Traffic Sources” from Google Analytics left-side navigation will show you a table listing the most active traffic sources and their medium. Direct traffic, as you would expect, has a medium of “none.” Traffic from Facebook, as an example, will have a medium of “referral.” Search engine traffic will have a medium or “organic” or “CPC” as described above.

Organic search engine optimization (organic SEO) refers to the methods used to obtain a high placement (or ranking) on a search engine results page in unpaid, algorithm-driven results on a given search engine. Methods such as boosting keywords, backlinking and writing high-quality content can all improve a site’s page rank. Black hat SEO methods, such as the use of keyword stuffing and link farming, can also boost organic SEO.
Hey Jym, thanks a bunch :) Yeah, I don't think everyone need to use each and every one of these, especially at the beginning. But I do find the list useful for those with "older" blogs. When you are thinking "Where else can I go to get more people to see my blog". That is what I do with my first website. Again, I agree with the part of identifying the ones that will work the best, so we don't spend too much time getting no results. Thanks so much for the comment
Hi there Brankica, Super WOW! You have a bunch of quality, very applicable listing here. I believe being present on these sites would mean alot of traffic and sales because these are targeted and well renowned sites. I bet I need a lot of hardwork to be present to these sites. And this hardwork pays! Thanks for sharing this entry of yours. This has been the greatest list I've ever read so far. Good job. Cheers, Kira Permunian
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: