I hadn't read the roadmap but I was reading posts from some of the original members before the xmas which stated that they were working on communities at the moment. I can't remember which users i was reading at the time but they basically said that their intention going forwards was to create communities similar to subbreddits which will make it much easier to follow content and find people interested in the same areas as yourself.
It was under development at the time but there was no dates stated for when it would be functional.
It should work very well for the site especially as we grow. One of the biggest problems that I have found here is how fast your content disappears from sight unless you have a huge following which most of us don't. Hopefully this will go some way to fixing that as well.