Google claims their users click (organic) search results more often than ads, essentially rebutting the research cited above. A 2012 Google study found that 81% of ad impressions and 66% of ad clicks happen when there is no associated organic search result on the first page. Research has shown that searchers may have a bias against ads, unless the ads are relevant to the searcher's need or intent 
The social media landscape is constantly evolving. New networks rise to prominence (e.g. Snapchat), new technology increases user participation and real-time content (e.g. Periscope) and existing networks enhance their platform and product (e.g. Facebook,Twitter, Pinterest and Instagram launching ‘buy’ buttons). Organic reach is also shrinking as the leading networks ramp up their paid channels to monetise platform investment.
Google is moving into more and more aggressively commercial spaces, like jobs, flights, products, all of these kinds of searches where previously there was opportunity and now there's a lot less. If you're Expedia or you're Travelocity or you're Hotels.com or you're Cheapflights and you see what's going on with flight and hotel searches in particular, Google is essentially saying, "No, no, no. Don't worry about clicking anything else. We've got the answers for you right here."
Organic-search traffic is the only search traffic you should be interested in. This is the traffic you get without any direct action on your part. It’s not something you can achieve with ease, though. The statistics say that 83 percent of organic clicks go to the first four results under most categories on search engines. So, to see your site attain that status, lay the foundations well in advance for the traffic you want.
Hubspot found that their articles up to 2500 words drive the most traffic. Similarly, posts with more than 2500 words generated more social shares and links. Naturally, it takes some investment to create that quality of content. The key is to come up with evergreen ideas. This way, your investment will more than pay for itself because your content will be serving your business goals years down the line. Put people first. The thing about search engines and how they rank content? It’s unpredictable. But one thing will remain constant. The job of a search engine is to connect users with the most relevant and useful information. If your content serves that purpose, you don’t have to fear algorithm changes.
Cost and Sustainability. While it’s not totally free and easy, SEO can be more cost-effective in the long run as it will give you a targeted and relevant results that you are aiming for your business. With regards to sustainability, even with the smallest of a budget, you can still develop a plan that will still give you the quality of results and still keep the traffic that your business is getting.
But search ranking is competitive, so naturally, it’s not easy to claim that top spot in organic search. That’s why many marketers and website owners pay to play, and why so many people choose the Pay Per Click (PPC) route. It’s fast. It’s effective. It’s high-visibility for your business. The caveat? You stop paying, and your visibility goes **POOF**.
Another ethical controversy associated with search marketing has been the issue of trademark infringement. The debate as to whether third parties should have the right to bid on their competitors' brand names has been underway for years. In 2009 Google changed their policy, which formerly prohibited these tactics, allowing 3rd parties to bid on branded terms as long as their landing page in fact provides information on the trademarked term. Though the policy has been changed this continues to be a source of heated debate.
Usually, paid links will have an indicator next to them (in the example above, the words “Sponsored” and “Ad” fill this role) while organic links are left bare. You’ll likely remember seeing paid posts on other websites like LinkedIn, Facebook, Twitter and Instagram. You may have even seen sponsored posts on industry websites, where brands will pay a publication to write about their product or something related to their business.
New zero-result SERPs. We absolutely saw those for the first time. Google rolled them back after rolling them out. But, for example, if you search for the time in London or a Lagavulin 16, Google was showing no results at all, just a little box with the time and then potentially some AdWords ads. So zero organic results, nothing for an SEO to even optimize for in there.
Search engines may penalize sites they discover using black hat methods, either by reducing their rankings or eliminating their listings from their databases altogether. Such penalties can be applied either automatically by the search engines' algorithms, or by a manual site review. One example was the February 2006 Google removal of both BMW Germany and Ricoh Germany for use of deceptive practices. Both companies, however, quickly apologized, fixed the offending pages, and were restored to Google's list.
So for the last 19 years or 20 years that Google has been around, every month Google has had, at least seasonally adjusted, not just more searches, but they've sent more organic traffic than they did that month last year. So this has been on a steady incline. There's always been more opportunity in Google search until recently, and that is because of a bunch of moves, not that Google is losing market share, not that they're receiving fewer searches, but that they are doing things that makes SEO a lot harder.
The position of a link on a search results page is important. Depending on the search term, organic search results often make up only a small portion of the page. Since ads are at the top of the results page, on a device with a relatively small display -- such as a notebook, tablet or smartphone -- the visible organic search results may consist of only one or two items.
Well, yes and no. Sure, you can get hit with an algorithm change or penalty that destroys all your traffic. However, if you have good people who know what they are doing, this is not likely to happen, and if it does, it is easy (in most cases) to get your visits back. Panda and Penguin are another story, but if you get hit by those it is typically not accidental.