BuzzStream can track the Twitter @mentions and direct messages with your contacts in BuzzStream (with Twitter id's in their contact record).
To add your twitter account to BuzzStream:
Go to the settings icon and select Settings from the dropdown.
Choose Twitter Tracking in the Settings options
Click Connect with Twitter. BuzzStream uses the twitter OAuth process to connect to your account. If you;re logged into your twitter account with the same browser BuzzStream will detect your account automatically. If you are not logged in you can enter the Twitter crednetials of the account you want to add.
Click Authorize App to complete the process. You'll be returned to BuzzStream.
The Connect with Twitter text in the button will be replaced with your Twitter ID. A green Box will be presented below to let you know you successfully connected.
If you ever want to connect to a different account use the link below the blue Twitter button connect to a different account. The same process will be repeated.
Twitter Privacy Options:
You have the option to make your Direct Messages with all contacts private. (By default all @mentions are public).
To make all your DM's private use the radio button options found under By default, who can see twitter direct messages for this account? Only Me makes all DM's private and Everyone sets them as public.