SEM - Search Engine Marketing (SEM) is a field where companies now spend tens of thousands of marketing dollars annually. In the field of Search Engine Marketing, like any other field, there are the good guys and the bad guys, so buyers need to be informed and have some basic knowledge to effectively ascertain whether or not
they are getting value for the dollar spent. Also, you must constantly use a persistent effort to keep track of vital records (check references, results, etc.)
to avoid unethical firms.
