We do not store any Twitter login passwords on our server. We use Twitters' OAuth to access your Twitter account on your behalf.
We do however store your Twitter: User ID, Screen Name, Username and basic Profile information.
We are legally bound to hand over any information requested by an official law enforment authority.
You should also be aware that all Tweets posted via TwitPlus are public and anyone can view them. If you are not comfortable with this please do not use this service.