I've been interested in this general question for a while. Years ago I ran a startup that connected strangers for spoken conversations. After tests, we kept it to audio only - no video, no text, no profile info. That was what kept the conversations civil. Add video, or text, or profiles and behavior changed (basically became a dating site). Results: F-M talks were only about 10% longer than F-F and M-M talks.
(Longer-term we focused on connecting people recovering from serious health issues.)
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