Wow, great post, Brankica!!! I've used Flickr in the past and while I haven't gotten much traffic from it, I've gotten a ton of backlinks. Like there's this one photo in particular that I tagged as "SEO" and included a link in the description back to the blog post I used the photo in. I guess there are lots of autoblogs that scrape stuff like SEO-related images, and since they scrape the description, too, I get lots of automatic backlinks. Sure, they're crappy backlinks, but still backlinks :)
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.