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. 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.
Internet marketing professionals refer to search that isn’t organic as paid search. Instead of organically, or naturally, reaching the top of the search results for a particular keyword, businesses can pay to get noticed. So, paid search is a bit like doing a local endorsement, TV ad or radio spot—but for the internet. When a consumer types in a search term that you’ve incorporated into your campaign, your ad will show up at the top of search page results, above the organic results. Sometimes, your ad may appear in the sidebar. Only if the consumer clicks on your ad do you pay anything.
Website owners recognized the value of a high ranking and visibility in search engine results, creating an opportunity for both white hat and black hat SEO practitioners. According to industry analyst Danny Sullivan, the phrase "search engine optimization" probably came into use in 1997. Sullivan credits Bruce Clay as one of the first people to popularize the term. On May 2, 2007, Jason Gambert attempted to trademark the term SEO by convincing the Trademark Office in Arizona that SEO is a "process" involving manipulation of keywords and not a "marketing service."
Use Facebook Insights to gain a better understanding of your Facebook fans. You can then target specific messages to meet the specific needs of subsets of your audience. For example, if you’re selling clothes and have written an article on the latest fashion trends for women, you can target your post to appear in the news feeds of women who have expressed an interest in clothes. Targeting options include Gender, Relationship Status, Location and Interests, etc. To target your Facebook post, simply click the targeting icon at the end of your post before you click Publish.
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 
Use long tail keywords. Don’t just go with the most popular keywords in your market. Use keywords that are more specific to your product or service. In time, Google and other search engines will identify your website or blog as a destination for that particular subject, which will boost your content in search rankings and help your ideal customers find you. These tools will help.