I found this fascinating quote today:
What would happen if an enlightened medical, new product or marketing team took the same RSS links and fed them into Twitterfeed and hence to a Twitter or Friendfeed account and aggregated numerous sources of interesting data? Would that be education or promotion? Or suppose there was also a blog with lovely widgets and chicklets saying Add Me to your RSS Reader or Email Me when a new post goes up or Share This with others via StumbleUpon, Digg, Mixx, Facebook etc.Sally Church, Pharma Strategy Blog, Feb 2009
You should read the whole article.