I am not completely sure what this means, but I believe it to be an interesting trend in convergence. LinkedIn is probably the largest online business to business social network. Yahoo Groups and the related discussion board technology has been around for quite a while. And now, bloggers who use LinkedIn have formed a discussion group on Yahoo called LinkedInBloggers. The group is just now formulating directions, goals, and focus...so, if this is an area of personal interest, consider joining the discussion. I believe the leaders of the discussion group to be well qualified to moderate a lively group.
Of course, I am asking myself...why hasn't LinkedIn figured out that people might like a forum within their site to engage in discussion? Who knows, there might be enough traffic in that type of forum to interest advertisers.
UPDATE: Joe Bartling has announced the LinkedIn Bloggers group also.