How many online forums have more members than 2+2?

[Ulysses]

We did this a while back, but 2+2 has been growing rapidly. 2+2 now looks like it has about 47,000 registered members.

How many forums have more? A few? A ton? I have no idea and am curious. BTW, we need to get all of these forums voting for Forest.

FlyerTalk has 80,000 registered members.

Is SlashDot the biggest? How many members do they have?