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As soon as it's open to the general public, it will be simple and quick to create a space, grab a gadget from the gallery of 50 that already exist, and then paste the Space's URL into a chat window, e-mail message, tweet or any other content-sharing platform.
If users know JavaScript, they can create their own gadgets and then rapidly build a Space around it, inviting all to participate.
Google didn't say when this semi-closed Shared Spaces beta will be available for everyone, but it's nice to know that there is yet another form in which Google Wave will still continue to exist.