In 1998, two graduate students at Stanford University, Larry Page and Sergey Brin, developed "Backrub", a search engine that relied on a mathematical algorithm to rate the prominence of web pages. The number calculated by the algorithm, PageRank, is a function of the quantity and strength of inbound links.[21] PageRank estimates the likelihood that a given page will be reached by a web user who randomly surfs the web, and follows links from one page to another. In effect, this means that some links are stronger than others, as a higher PageRank page is more likely to be reached by the random web surfer.
Check out the average CPC for some top industries. These are the costs of one click. Mind you, that’s a click that is not guaranteed to convert a customer. With paid campaigns, you have to keep optimizing and testing the ad creative to lower your CPC and increase your CTR. You can imagine that it takes a massive budget to even set a paid campaign in motion. And it requires just as much to keep maintaining it.

Chrys was bitten by the entrepreneurial bug at an early age. At age 10, she bought soccer cards in bulk and sold them in school. Later, she turned down a university scholarship and moved to Thailand to start an apparel business. By age 27, she started and ran two online businesses while living around the world. She now runs Chrys Media, an educational company that runs online conferences, courses, and workshops for entrepreneurs and marketers.

Look at your short- and long-term goals to choose whether to focus on organic or paid search (or both). It takes time to improve your organic search rankings, but you can launch a paid search campaign tomorrow. However, there are other considerations: the amount of traffic you need, your budget, and your marketing objectives. Once you’ve reviewed the pros and cons, you can select the search strategy that’s right for you.

Search engine marketing, or SEM, is one of the most effective ways to grow your business in an increasingly competitive marketplace. With millions of businesses out there all vying for the same eyeballs, it’s never been more important to advertise online, and search engine marketing is the most effective way to promote your products and grow your business.
To give you an idea of just how much money is being spent on paid search, take a look at Google. Google's AdWords program is the most used pay-per-click (PPC) advertising program available today. While the tech giant owns YouTube and Android, among hundreds of other profitable brands, AdWords accounts for roughly 70% of their revenue -- which speaks wonders for its effectiveness.
The fee structure is both a filter against superfluous submissions and a revenue generator. Typically, the fee covers an annual subscription for one webpage, which will automatically be catalogued on a regular basis. However, some companies are experimenting with non-subscription based fee structures where purchased listings are displayed permanently. A per-click fee may also apply. Each search engine is different. Some sites allow only paid inclusion, although these have had little success. More frequently, many search engines, like Yahoo!,[18] mix paid inclusion (per-page and per-click fee) with results from web crawling. Others, like Google (and as of 2006,[19][20]), do not let webmasters pay to be in their search engine listing (advertisements are shown separately and labeled as such).

Organic content marketing, on the other hand, finds ways to make customers look for you naturally. In effect, it means using any type of marketing method that doesn’t require a direct payment. But, there are still costs involved. These include paying for content creation and the time spent monitoring the campaign and responding to customers. This type of inbound marketing involves providing valuable content that customers need. Then, supporting it with a constant, online presence (often through social media).

Look at the different search engines (sources) that drive traffic to your site to determine where you want to invest your resources. For example, if you're getting an overwhelming amount of visitors and revenue from a particular search engine, that's an obvious source of profitable traffic and an area in which you might want to make further investment; but you might also find another search engine that delivers only a few visitors, but ones who represent a very high Per Visit Value. In this latter case, you might want to increase your spend in that area to drive more of those high-value visitors to your site.
Regarding Link Detox, links it diagnoses as Toxic are generally fine as they're either not indexed by Google or have malware/viruses/etc., but I recommend a manual review of any diagnosed as Suspicious. I used it recently to get started cleaning up our backlinks and some legit sites and blogs were under Suspicious simply because they didn't have many links pointing to them.

The first one is pretty powerful and pretty awesome, which is investing in demand generation, rather than just demand serving, but demand generation for brand and branded product names. Why does this work? Well, because let's say, for example, I'm searching for SEO tools. What do I get? I get back a list of results from Google with a bunch of mostly articles saying these are the top SEO tools. In fact, Google has now made a little one box, card-style list result up at the top, the carousel that shows different brands of SEO tools. I don't think Moz is actually listed in there because I think they're pulling from the second or the third lists instead of the first one. Whatever the case, frustrating, hard to optimize for. Google could take away demand from it or click-through rate opportunity from it.

Remember when you used to rely solely on search engines for traffic? Remember when you worked on SEO and lived and died by your placement in Google? Were you #1? Assured success. Well, okay, maybe not assured. Success only came if the keywords were relevant to your site users, but it was the only real roadmap to generating site traffic and revenue.