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whiteboarding

n. (context Internet English) A collaborative discussion over the Internet in which participants can write and draw on a shared space resembling a whiteboard.

Wikipedia
Whiteboarding

Whiteboarding is the placement of shared files on an on-screen shared notebook or whiteboard. Videoconferencing and data conferencing software often lets the user annotate the shared documents as on a physical whiteboard.

With this type of software, several people can work on the image at the same time, each seeing changes the others make in near-real time.

Electronic whiteboarding was included at least as early as 1996 in the CoolTalk tool in Netscape Navigator 3.0.