TodaysMeet is one such example. Before the lecture, workshop, or seminar, access the site and name your "room" and select how long the data should be stored. This creates your very own URL that you can share with attendees who can then access a very clean chat screen to comment.
It's that simple. No accounts to create, no passwords to remember. And the best part is that anyone can access a transcript to remember what has been discussed (or keep track of student participation or...ahem...appropriate and on-task comments.)
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