Hawthorn is based on the concept of affinity groups, a group of individuals who come together around a shared experience, interest or common goal. With Hawthorn affinity groups, you are free to start or join conversations and share useful resources with people in your community.
As the number of communities and threads grow, there will need to be a way to find communities and threads of interest.
Some ideas that have been mentioned are a search feature and categorization by tags.