People are more receptive to hearing these marketing messages because they are more natural and organic. They’re not paid for and stuffed in their faces through interruption marketing. An indelible experience has intrinsic emotional and psychological value, as people enjoy it. They then feel emotionally compelled to share their experience with others that they have a close relationship with as part of relating, so that they can share in the emotional experience too. This is done through conversation, phone, text, email, Facebook shares, Tweets, and the like.
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 
If the first era of social was engagement, the new era is acquisition and conversion. Social commerce is growing much faster than retail ecommerce, although it’s early days. The top 500 retailers earned $3.3bn from social commerce in 2014, up 26%. Many retailers I work with are seeing social driving bigger % increases in retail traffic than any other channel.
For our client: We took the top PPC terms based on conversion and worked these keywords into existing pages on the website. We also created new high-quality content-based pages from these conversion terms. This type of strategy can work very well in assisting overall conversions on the website and driving more revenue. We also conducted a large-scale keyword research project for the client which yielded in uncovering many areas of opportunity for content development and targeting.
Plan your link structure. Start with the main navigation and decide how to best connect pages both physically (URL structure) and virtually (internal links) to clearly establish your content themes. Try to include at least 3-5 quality subpages under each core silo landing page. Link internally between the subpages. Link each subpage back up to the main silo landing page.
I think for agencies as far as how we appear in organic search ourselves, we are definitely going to need to leverage all 3 of the solutions you talk about and agencies who haven't branded their products/services are going to have to do that and are going to have to also employ branding strategies. In addition, we have to optimize for other search ares like you say in your point #2 and we must look at optimizing existing content for voice search and answers/featured snippets like you say in point #3.
To do this, I often align the launch of my content with a couple of guest posts on relevant websites to drive a load of relevant traffic to it, as well as some relevant links. This has a knock-on effect toward the organic amplification of the content and means that you at least have something to show for the content (in terms of ROI) if it doesn't do as well as you expect organically.
I would also advise to continue doing what works. If something you have rolled out generates great traffic and links bring out a new version of the content, for example the 2012 version worked effectively bring out the 2013 version of the content. Another effective strategy is to make the piece of content into an evergreen article which you add to over time so it is always up to date.
That said, ground-up marketing works because it’s work. There’s no substitute for careful attention to your website’s content and careful curation of your business’s social media presence. Paid ads can be an effective tool within a high-budget marketing strategy, but if the consumer arrives at your website and doesn’t find what they’re looking for, how is that investment working for you? It’s not. If a sponsored tweet draws them in but a discrepancy in expectation chases them away, what’s the benefit there? It’s absent. Organic marketing is a long process, but ultimately it will yield more authentic customer engagement and more accurate SEO.
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The last thing you need to do is evaluate the results and simply do it all over again. You will need to be constantly reassessing your organic marketing plan. The situation, audience, and goals will be constantly changing. Your marketing plan will need to change to adapt to this flux. You should reevaluate your organic marketing strategy at least every quarter.
Paid inclusion is a search engine marketing method in itself, but also a tool of search engine optimization, since experts and firms can test out different approaches to improving ranking and see the results often within a couple of days, instead of waiting weeks or months. Knowledge gained this way can be used to optimize other web pages, without paying the search engine company.