Presidential PR

  Watching the President in this video, I question if the executive branch should be promoting twitter or any other competitive service over another.
  Why should we only use twitter to communicate to our representatives? What's wrong with email, telephone, letters (remember those?) or for that matter any other multitude of social networks like Facebook and Google+?
  Why not suggest people blog about it on Wordpress or Tumblr?
  Surely we can't rely on only one means of getting the attention of our elected representatives?
  Or is this some form of Public Relations push for the twitter company?
  I don't see this form of preferential treatment coming from the Whitehouse for any other industry, like the automotive, or airlines. "Take your Ford and go to the mall this weekend to support the economy" would certainly raise concern, so why not in the technology industry?
  I'm sure its related to the equally unjust practice of archiving all tweets sent (evah!) in the library of congress.