[simanyay]

You can export your data whenever you want and the process is as easy as clicking one button: http://dl.dropbox.com/u/447925/Screenshots/ao8k.png

Nothing changes when you comment on a website using Disqus—your comment is published on someone's website and becomes their data. That said, if a comment was not originally anonymous, you have an option to anonymize it so that it is not associated with your profile and name anymore. We are and will always be on commenters' side.

This is what I can authoritatively say as a Disqus engineer. If you want more information, email to [e-mail] and folks here will be happy to answer all your questions.

Anton