[@anointed Participant 14 years, 10 months ago]

Nothing specific to bbPress, however topics are nothing more than a custom post-type for WordPress.

That means if you can find a twitter plugin for WordPress where the plugin author set it up to work with custom post-types, then you are set. Frankly it should not be that difficult to modify a number of the twitter posting plugins to work with bbPress as bbPress uses WordPress standards 100%.