I have at least two apps associated with Twitter links (Chrome and Twitter) and according to some other forums:
Settings > Applications > Manage applications find your application that you chose as your default app for that intent, click Clear defaults
This works for other associations, e.g. PDF is associated with Adobe Reader, but for some reason it is not associated with Chrome nor with Twitter, yet it opens in Chrome without asking for Twitter.
How can I change the intent's default association to be Twitter? Will reinstall twitter do the trick? Is there any other way?