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Talkwheel’s design makes class conversations easier to follow, more interactive, and more effectively organized. It eliminates the problem of navigating multithreaded conversations, enables real-time group conversation, and makes referencing asynchronous conversations much easier. Talkwheel’s dashboard organization allows teachers to organize all their classes and projects in one centralized location, while Talkwheel's analytics helps teachers and administrators quantitatively monitor their students’ progress throughout the year.

Quora is a Q&A site nicely integrated with Facebook that has done a good job providing a means to ask questions and get answers.

Quora has been able to form quite an elite network of VCs, entrepreneurs, and other experts to answer questions.  They've also created topic pages such as: Learning Management System. 

Finally, Namesake, is a tool for real-time and asynchronous conversations.  It's a bit like Quora but more focused on conversation as compared to Q&A and it allows real-time conversation a bit like twitter.  You can see an example of a conversation around phones below.

All of these point to new types of conversation models that are emerging in tools.