I'm more interested in the approach of world leaders to twitter. As far as I'm concerned, people receiving salaries from the taxpayer shouldn't be spending their time writing free copy for twitter. They should be communicating with the public via government operated websites, or press conferences covered by multiple media organizations.
If the president feels a need to push out realtime text snippets, it can be done via an RSS feed on whitehouse.gov, and people can consume it via whatever app / client they want. If twitter wanted to scrape that and provide access to it, fine, but they shouldn't be given a free monopoly on that content.