Social networking for work

I've been trying out groups on LinkedIn, but for Hadoop and Java the posts are dominated by recruiters and minor flame wars. The Hadoop and associated technology mailing lists are far more informative and useful. It looks like twitter is another place for seeing what's going on in Hadoop land. I need to spend more time there.

Whenever I'm looking for a new job I'll head back to LinkedIn. Until then I need something better.