How does it work? In essence, you use Google Adwords (or another search engine’s equivalent – depending on the market you work in; in China, you’d be looking at Baidu, for example) to place bids on keyphrases; you write an advert based on that keyphrase; the search engine places the advert near the top of the search rankings, and you pay the amount of the bid every time someone clicks on your advert.
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Your company’s social media profiles can also rank in search engines. Try Googling your company right now. Do your social media profiles pop up? Companies that work to build their social media presence will often see their Facebook, Twitter, LinkedIn, and other social profiles alongside their company’s website on the search engine results page. The best way to get your social media profiles to rank is by staying active and consistently engaging with your fans and followers across your social profiles.
One thing is certain: interlinking sites doesn't help you from a search engine standpoint. The only reason you may want to interlink your sites in the first place might be to provide your visitors with extra resources to visit. In this case, it would probably be okay to provide visitors with a link to another of your websites, but try to keep many instances of linking to the same IP address to a bare minimum. One or two links on a page here and there probably won't hurt you.
Search engine optimization is especially important for small businesses that want to compete in the online market place. Most small businesses have limited digital marketing budgets. Though they may not able to compete with larger companies when it comes to advertising, SEO levels the playing field a bit. Any company, regardless of size can work to improve their search engine optimization and boost their ranking on the SERP.