Blab is a live-broadcasting app that streams video to a “Public” or “Unlisted” stream (host’s choice). With 4 “Open-Seats” available in each Blab, topic-driven conversations are shared with a live audience. Interaction also occurs via text through live audience participation. While anyone can call-in (or ask) for an “Open-Seat”,  only the host can approve who receives the spot.

Source: Blogging About The Web 2.0 Connected Classroom: 10 Student-Centered Ways To Use Blab In The Classroom with @shfarnsworth

I had never heard of Blab before, but it looks to be a pretty neat alternative to Google Hangouts.

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