The Gurteen Knowledge Community Group on LinkedIn is now up to 5,700 members and is still one of the more active of all the KM LinkedIn groups. Take a look if you are not a member and join up if you like it.
But note, each week I receive a large number of posts to the forum which are simply pointers to blog posts.
If I let them all through the forum is no longer a discussion forum but a promotional vehicle for blogs (like so many others).
These blog posts are also often posted to many other forums - to my mind verging on a kind of forum spam.
I let the occasional promotional post through (often the first one or two before I switch on moderation for that user).
I also let promotions of events through - as long as they are not too frequent.
A suggestion though, if you wish to post an article to the forum then do it in the form of a question to people in order to stimulate a conversation. This is the prime purpose of the forum and I would like to see a lot more discussion going on.
