Q: What is the single most important factor in Search Engine Optimization ? A: A recent survey of Search Engine Optimizer and Marketers on LinkedIn widely agreed that the title meta-tag was the most important element for search engine optimization. The title meta-tag should begin your main keyword and include as many other important words you can fit in 70 characters. Remember that even though your company name is important to you, unless people are going to search for you by your company name save it for the description meta-tag. The title meta-tag is too important to clutter with an unknown company name.