I’ve microblogged regularly in my own company’s intranet platform and found it particularly useful to help me find people, recent information, or discuss and debate issues with my peers across the organization.
I stay on top of the current news across the company—beyond just the official news sources—by peeking into my activity stream. Unlike what you might see on public personal social networking sites, most of the discussions revolve around projects, customers, enterprise issues, glocal events, or requests for assistance.
While there are casual conversations as well, what you really find are work-focused conversations you might hear in any company—just taken to a global, location-independent, and online level.