There’s also other search engines. Ask, Dogpile, IxQuick, and so forth; these are all minor. However, one search engine seems to be gaining market share and exposure, and that’s DuckDuckGo. It has been trending in the wake of Google privacy concerns and some clever marketing from the DDG staff. It’s something you should, at least, pay some attention to.
Organic traffic is a special kind of referral traffic, defined as visitors that arrive from search engines. This is what most marketers strive to increase. The higher you rank for certain keywords, the more often your search result appears (increasing your impressions), ultimately resulting in more visitors (aka clicks). It’s also important to note that paid search ads are not counted in this category.
Love the five different area of investigation that you went over, great way to analyze and diagnosis the issue. I would also definitely agree doing a rankings comparison between the two time frames, and not only check what your Google ranking is, but also track the search volume for your keywords to see if it has fluctuated or gone down. Google Trends is a great tool for this as well, as one of your keywords that your ranking for may have just lost popularity online.
Get really good at campaign tagging: Even amongst data-driven marketers I encounter the belief that UTM begins and ends with switching on automatic tagging in your email marketing software. Others go to the other extreme, doing silly things like tagging internal links. Control what you can, and your ability to carry out meaningful attribution will markedly improve.
I had great results with Stumble Upon cause I have been a user for years and Stumble a lot of things that have nothing to do with blogging or my blog. And Networked blogs is working great for me too :) I am glad you found some new sources here. I would love, if you had the time, to look into one or two that seam interesting to you, and maybe try them out... and then come back and tell me if they worked OK for you?