Brankica, Very comprehensive list there. Can't think of anything else :D RT! I think the traffic sources that I hardly use is answering questions. I find that traffic conversion there is poor for me, so I don't focus too much on it. I think of all those in the list, focus on those that gives you the best kind of traffic. Forums can be a particularly useful one especially when people are there asking for help. Answering their questions and giving them a link that benefits their query is one good way of getting the right kind of traffic.
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.
This is the number of views that you can test each month on your website.It's up to you how you choose to use them, either by allocating all the views to one test or to multiple test, either on one page or on multiple pages. If you have selected the 10.000 tested views plan and you run an experiment on your category page which is viewed 7000 times per month, then at the end of the month 7000 is what you'll be counted as tested views quota.