You can find out more about the community here, but essentially there are 7 "levels" of participation raging from 75k words in a year to 500k. I hit my goal of 200k this past year, and I think I'm going to shoot for 250k in 2017!
There are a ton of really interesting and thought-provoking posts on writing that go up throughout the year, and there's no shortage of support if you need it.
Anyway, if you're the kind of person who likes structure and goals (like me!) then I'd totally recommend. Sign-ups are open until January 15th! :D