| http://www.w3.org/ns/prov#value | - I have not used it myself, but have heard good things from others, plus I do not believe it requires users to sign up for anything new (like Google+ or Skype would).I think starting with 10 participants is a good idea, and you can adjust from there if that ends up being too few or too many, but I would like to have the ability to eavesdrop even if I am not one of the chosen 10.
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