Best online community for WW1?

[BigDuke66]

The only forum so far is this one:
http://1914-1918.invisionzone.com/forums/
A lot other stuff can be found covering a wide range on the topic of WW1 but regarding a message board the above seems the only one that is big & English.

I might have to do it more "locally", unlike WW2 where such forums as Axis History can be found that despite being focused on the Axis is a pure English forum, for WW1 it might be good to see if I can find some in German to also cover the other side of the conflict.