It seems like most people are on dog training Facebook groups nowadays. My suggestion is that you make a Dog Trick Academy group on Facebook. It could be a place where we can do stuff that might be considered spam on the forums, like share pictures of our dogs and just give updates. It also might bring some traffic to this website. Like, if a question is asked, someone can give them a link to a thread from DTA forums or your blog.
I think we already have so many forums on here that are rarely used. Look at the latest posts on some of these. They haven't been used for ages. At any given time, there are way more guests on the forums than members, so I think it is more up to the current members to be active on the forums to keep the content attractive to new members. I had been away from the DTA for a few months in the fall, and when I came back, there were hardly any new posts. As far as I have seen the only things that are considered spam is people joining so they can try to drum up business for pet insurance or real estate or something along those lines. There are plenty of places on here for photos and updates. No one is very strict about what you can post and where, as long as you are respectful and are espousing the Positive Reinforcement methods.
Personally, I am not a big fan of "the facebook", and I know quite a few people who have fallen out of love with it lately. I only use it to keep track of my immediate friends and family (people who I know in real life!), my local NHL team, and a few other businesses, but even those send me email newsletters on a regular basis, so facebook is a little redundant.