If you want, you can take a minute to review last week’s article or check out the Business Insider infographic that pulls everything together in one image. I can easily see why many firms turn their online marketing over to outside companies. Can you imagine trying to navigate through all that without a road map, when all you really want to do is focus on your customers and the products and services you provide? These days, though, SEOs must understand social media marketing. So let’s look at some of the categories displayed in the image I referenced. Last week I discussed Twitter apps: what t…