Collaborative computing, Exchange and Windows Server Engineering, PowerShell for Exchange, and the next steps that will evolve as traditional corporate email goes mobile, cloud-based, instant, and social.
And, if you are looking for an expert on the Semantic Web, or Drupal for that matter, here is a link to Mike's Digital Laboratory.
Personal Aside: If you are wondering why I would blog about my brother..., I would just like to add that I come from a long line of tech geniuses. Contrary to rumor, my father, Art Axelrod, did not invent the Internet. He did however, set up the first Intranet at Xerox. From time immemorial Axelrods have been Engineers, Draftsmen, Locksmiths, etc.
I cut my teeth playing "Star Trek" on green bar paper with a portable terminal Dad would bring home from work, acoustic coupler and all. My grandfather Nathan, would drive us around the New York city area and show us bridges and overpasses that he helped design and draw blueprints for. When I was younger I claimed I did not want to be an Engineer or work with computers. You can see how well that worked for me. :-)
It's clear that many businesses ARE approaching social media. Dell Outlet "tweets" its coupon codes and specials on Twitter, Facebook Fan pages for companies are spreading, and many corporations have embraced blogging as a way to communicate with customers.
Depending on your business size, and what sector it resides in, it might make a lot of sense to have someone in your marketing department in charge of online media. At the very least, you should be performing searches on who is Twittering about your company. It's all an opportunity to engage your customers, and a lot of it can be used as free or low cost marketing. Makes sense in these days of everyone wanting to get something for a bargain.