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Backchannel - Wikipedia
Backchannel (linguistics) - Wikipedia
Back channel Definition & Meaning - Merriam-Webster
What is a Backchannel? - Definition from Techopedia
Backchannel Is Moving to WIRED
7 Things You Should Know About Backchannel Communication
BACKCHANNEL | English meaning - Cambridge Dictionary
News From Backchannel. We’re now officially and totally
Backchannel (blog) - Wikipedia
Why I Started Backchannel - WIRED