I was doing some work on my LinkedIn profile this week
http://www.linkedin.com/in/cameronthompson and saw a link to Barack Obama's profile, amongst others.

Obama's campaign made brilliant use of social media and online networking tools. But he hasn't stopped there - updating the U.S. people from YouTube on a weekly basis, trying to build a more open democracy and developing new platforms for people to communicat with his government.
Whatever you think about him and the political views he represents, social media is truly a part of what he is about, as opposed to his competitors for the presidency. All of their profiles still list them as candidates!

If the President of the U.S.A. thinks its worthwhile to develop their social media profile, that's good enough for me!