You can add a chat box to Blackboard that will provide your students with direct access to a reference librarian.  This chat box will be active during normal reference desk hours.  For those hours, check here.

Paste this code into Blackboard to generate the chat box:

<iframe src="http://libraryh3lp.com/chat/csufreference@chat.libraryh3lp.com?skin=10289&amp;theme=jsf-text2&amp;title=Ask&amp;identity=Librarian" frameborder="1" style="width: 235px; height: 270px; border: 2px solid #000;"></iframe>