Interdisciplinarity is growing. The internet has made it easy for people with diverse interests to research and work on many projects unrelated to their job or primary study. Reddit, the popular link-site / discussion board, is no exception. Reddit is a great tool for people with diverse interests because it makes it easier to follow developments in many different fields without belonging to the relevant social circles.
I’m familiar with at least two subreddits: /r/interdisciplinary and /r/polymath. The first is the largest and perhaps has the best content. Better, we have control over it, so we can attempt to link it up with the polymath project if there is some occasion to do so.