Avoid Twitviewer

What is twitviewer? twitviewer is an app to view twitter conversation.

Cool, but it appears that may be a phishing scam, or at the least, is probably not doing what it promises.
Upon entering your credentials, it does show you a list of users that supposedly visited your profile, but it seems likely this is fake.
Just avoid this app, and if you logged in, you may want to consider changing your password .