hey james - congrats on your success here. just a question about removing crummy links. for my own website, there are hundreds of thousands of backlinks in webmaster tools pointing to my site. The site has no penalties or anything - the traffic seems to be growing every week. would you recommend hiring someone to go through the link profile anyway to remove crummy links that just occur naturally?
The first step that I take is to do a quick Google search to find pages on my domain where I've mentioned the keyword in question so that I can add an internal link. To do this, I'll use the following search query, replacing DOMAIN with your domain name (e.g. matthewbarby.com) and KEYWORD with the keyword you're targeting (e.g. "social media strategy"):
Google claims their users click (organic) search results more often than ads, essentially rebutting the research cited above. A 2012 Google study found that 81% of ad impressions and 66% of ad clicks happen when there is no associated organic search result on the first page. Research has shown that searchers may have a bias against ads, unless the ads are relevant to the searcher's need or intent 
Determining which keywords to target and how to incorporate them into your messaging is also a big factor in social media marketing. This guide to Keyword Research for Social Media is a good resource for determining which keywords your audience is using and covers everything from how to conduct keyword research for YouTube to researching keywords for Facebook.
Beyond organic and direct traffic, you must understand the difference between all of your traffic sources and how traffic is classified. Most web analytics platforms, like Google Analytics, utilize an algorithm and flow chart based on the referring website or parameters set within the URL that determine the source of traffic. Here is a breakdown of all sources: