By Guy Stannard Search engine marketing or SEM is an ongoing effort for companies that wish to gain recognition from their local and global markets. It involves the placement of ads at the top of search engine results. No matter how well a site ranks on its own, people are still guaranteed to see it. This is something that you can learn more about by consulting with a Dallas TX SEO company. It is important to note that most consumers can tell the difference between paid and organic listings....