Keynote Tweet is a free, simple to use and open source script that provides the capacity to participate in the backchannel by combining Twitter with Apple Keynote.

All you have to do is add text wrapped in [twitter] and [/twitter] tags in the presenter notes section of a slide. When that slide comes up in the presentation the script grabs that text and sends it to Twitter on your behalf.

Out of the box it will ask you if you want to add any #hashtags or @mentions to all the tweets (e.g. for a conference #hashtag), and will watch your presenter notes for [twitter]twitter this[/twitter], ignoring the rest of your notes, while in presentation mode only.

In order for the code to work you’ll need to have your Twitter credentials in your Keychain. If they’re not in there already, use Keychain Access to add a new password to your login keychain with the following information:
· Keychain Item Name: http://twitter.com
· Account Name: Your email address
· Password: Your Twitter password