The community aspect comes in the form of camaraderie across social media platforms like Facebook and Twitter, and you can also join the Nanowrimo forums to discuss all aspects of the novel writing process and share your journey with other participants.
Just be sure to use all the writing tools at your disposal. Get quality feedback, guaranteed. Scribophile implements a fair exchange system for getting feedback on your work. There are dozens of discussions about writing-related topics to get involved in, and a section where you can find yourself a beta reader, writing buddy or mentor.
So here are some of the best Facebook groups for writers. All manner of creative writing will find a home on the site. You can also join the global community on the site.