This is a crucial area. If you do not have schema markup and rel="author", you are costing your business money. It is as simple as that. As an example, say I want to make spaghetti (pasta) for dinner I search for “Spaghetti Recipe” and instantly I see some great markup in play, but one competitor has no markup and no rel="author" they are losing business in my eyes. Wouldn't you agree?.
I had great results with Stumble Upon cause I have been a user for years and Stumble a lot of things that have nothing to do with blogging or my blog. And Networked blogs is working great for me too :) I am glad you found some new sources here. I would love, if you had the time, to look into one or two that seam interesting to you, and maybe try them out... and then come back and tell me if they worked OK for you?
The term “organic traffic” is used for referring to the visitors that land on your website as a result of unpaid (“organic”) search results. Organic traffic is the opposite of paid traffic, which defines the visits generated by paid ads. Visitors who are considered organic find your website after using a search engine like Google or Bing, so they are not “referred” by any other website.