From DSC:
The “Pair & Share” method allows students to find a fellow student to talk about the question/topic at hand. Then, depending upon time and your learning objectives/lesson plans, some students can report back to the larger classroom about what they discussed. In the digital, synchronous realm, one can achieve this with private chat rooms — given that you’ve changed a setting to allow this to occur. Posting the pairings ahead of time should help establish a quick, smooth transition.

(The graphic below is for the Cisco Webex Meeting Center on a MacBook Pro).

Providing a quick pair and share method using the Cisco Webex Meeting Center product