Saffron - 2:03 pm on Mar 6, 2013 (gmt 0)
Yes, I'd say probably 90% of my traffic is down. I used to rank no. 1 with almost all of my articles. If not no. 1, I'd be no. 2.
I'm doing the same as you. I did have a FB group but never really used it much. So I've been interacting there. I've looked at my weak content and either improved it or scrapped it. Added more images to articles, done the author tag thing, and I had around 15 articles provided to me by "experts" in my field. Some were okay, some were very poor. I'm slowly going through all of those articles and re-writing them. The benefit is they're all consistent plus it dawned on me that those "experts" had also given the articles to other websites too, which meant duplicate content.
It's frustrating to throw so much at this and see a continual drop in traffic when it's a good site. It's not one of the crappy sites Google is supposedly targeting. I have never engaged in link building, dodgy SEO tactics. I just wrote lots of content.