Wow Brankica, what a list! Completely and utterly usable list that I am sure to apply in my niche. Very detailed post especially as you stated how to make the most of even the well known ones. We usually overlook the offline traffic generation forgetting that once upon a time, there was no internet. Slideshare sounds like something I could use. This post is unbeatable! Good job!
Because so few ordinary users (38% according to Pew Research Center) realized that many of the highest placed "results" on search engine results pages (SERPs) were ads, the search engine optimization industry began to distinguish between ads and natural results.[citation needed] The perspective among general users was that all results were, in fact, "results." So the qualifier "organic" was invented to distinguish non-ad search results from ads.[citation needed]

The SEO landscape has changed enormously in the last years. Organic traffic comes and go, the websites’ performance seems to be as volatile as it gets and at the end of the day, you might ask yourself: why did my organic traffic drop? Did Google change its algorithm again? Was a sort of SEO attack on my site or was it something that I did? And while you keep on searching for the reasons your hard-worked ranks and traffic went down the drain, your frustration gets bigger as the solution to your problem seems increasingly far.
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Google makes constant efforts to improve the search algorithm and detect quality content and that is why it rolled out the Google Panda 4.0 update.  What is this update really doing? It deranks low quality content and boosts the high quality one, according to Google’s idea of valuable content. In the screenshot below you can see what kind of content you shouldn’t be looking into if you are really determined in making a mess out of your organic traffic. 
Hey Michael, thanks so much for the comment. After this post, I decided to revamp my traffic generation strategy and work more on the existing sources and work a bit more on the ones I was not using that much. I saw results almost from the first day. This list is good because of the diversity of the ideas, cause if one thing doesn't work for you, there has to be another one that will sky rocket your stats :)

Good content is not enough anymore. Your articles have to be outstanding and must be much better than the one of your competitors. Don’t write just and useless articles just for the sake of publishing something new. Instead, concentrate on quality and make your content stand out from the crowd. The competition is increasing as we speak, and quality will be the only way to succeed.

The time might have come when you want to secure your website and switch from HTTP to HTTPS. Easier said than done. A lot of issues might appear along the way that can screw up your hard-worked organic traffic. However, there is one thing that can really mess up things for your website while moving your site to https; and that is the canonical tag. 
I've started a fairly new blog, aimed at fairly new bloggers, by a fairly new blogger! I've had another blog up and running for about four months and it's building up quite well, but I've learned a lot from you here, and am looking forward to trying all the ideas that are new to me. You've been so thorough that I can't suggest a 51, but perhaps a 50a - I use Tweetadder with my Twitter accounts; it's a brilliant tool for automating tasks and driving traffic. I won't spam the comment with a link here, but there is one on my blog for anyone who is interested. Thanks again for all those ideas, cheers, Brent

If you’ve recently modified your on-page copy, undergone a site overhaul (removing pages, reordering the navigation) or migrated your site sans redirects, it’s reasonable to expect a decline in traffic. After reworking your site content, Google must re-crawl and then re-index these pages. It’s not uncommon to experience unstable rankings for up to a few weeks afterwards.
I've started a fairly new blog, aimed at fairly new bloggers, by a fairly new blogger! I've had another blog up and running for about four months and it's building up quite well, but I've learned a lot from you here, and am looking forward to trying all the ideas that are new to me. You've been so thorough that I can't suggest a 51, but perhaps a 50a - I use Tweetadder with my Twitter accounts; it's a brilliant tool for automating tasks and driving traffic. I won't spam the comment with a link here, but there is one on my blog for anyone who is interested. Thanks again for all those ideas, cheers, Brent
If you don’t want your Google traffic dropped dramatically due to indexing and content pruning, we are going to list below the steps you need to take in order to successfully prune your own content. We’ve developed this subject in a previous blog post.  Yet, before doing so, we want to stress on the fact that it’s not easy to take the decision of removing indexed pages from the Google Index and, if handled improperly, it may go very wrong. Yet, at the end of the day,  you should keep the Google Index fresh with info that is worthwhile to be ranked and which helps your users. 
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?.

Organic traffic is the primary channel that inbound marketing strives to increase. This traffic is defined as visitors coming from a search engine, such as Google or Bing. This does not include paid search ads, but that doesn’t mean that organic traffic isn’t impacted by paid search or display advertising, either positively or negatively. In general, people trust search engines, and sayings such as “just Google it” reinforce that humans are tied to the search engine. Thus, paid search, display, or even offline campaigns can drive searches, which may increase organic traffic while those campaigns are running.
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