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You can revoke the app in your Twitter account to disable it (Settings > Applications) -- I haven't added an on-site option to do that yet, but it will be added eventually.
For some reason my phone doesn't allow me to acces the site. At least; it says the "page doesn't exist". I have yet to try it on my computer though, but i just wanted to update you on what happened. I have a Samsung Galaxy Core 2 and downloaden the Twitter app, and whenever i press the button to change autorization on the exophase site itself, it gives a screen (in the browser, not in the app) in which it says the page doesn't exist. It does however open on the twitter URL, and the twitter icon is displayed at the tab-page. Remember: this happened on my mobile phone. Maybe this info was usefull, maybe not, i don't know. Anyway, i was able to disconnect Exophase with my computer. Thanks again!