RIM released another beta update to its BlackBerry Twitter app. The version 2.1 beta brings the BlackBerry Twitter experience closer to what is available on other mobile platforms.
Twitter for BlackBerry Smartphones v2.1 (Beta): Multi-Account Support (Official BlackBerry Blog)
The biggest enhancement is the ability to use more than one Twitter account. One common use-case for multiple accounts is a person who maintains personal and business Twitter accounts. There is a Switch Account function to work with multiple accounts. Tweets can be cross-posted across accounts. And, a retweet can be made between accounts within the app.
The Switch Account function is found in the Profile screen represented by a double arrow icon. The new Edit Profile function (represened by a pencil icon) lets a person change the picture or update personal information