My answer to "Difference between revokeFacebookConnect and revokeOauthToken"

This is my answer to a Question on Support site for LampCMS project

These methods just remove the oauth token from their account (document in USERS collection)
These methods are used internally to unset the Twitter, Facebook details when the APIs return authorization errors.

So basically if script is trying to post to Twitter on behalf of user but Twitter API returns some type of authentication error we realize that user probably removed our app from their Twitter account. We then remove the Twitter token from user's account so that next time we don't waste time trying to post to Twitter API again, essentially will treat that user as someone who has not added Twitter to their account.

If you want you can write a script that will call these methods manually allowing user to remove the Twitter or Facebook credentials from their account.