The worm asks for Twitter authorization and tweets that message to more unsuspecting users. Link shortener Bit.ly has stopped the scam by blocking domains hosting those scam links. If the app you’re using to access Twitter still has permission to do so, it could keep spreading this nuisance with a different shortened link. It’s easy enough to go to Settings/Connection/Revoke Access, and then you’re free of it. The worm appears like this (notice the tweetviewer link:):
Source: https://thehackernews.com/2011/03/virus-alert-tweet-viewer-worm-crawling.html