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Bebo can't be the only one having fun with open platforms for developers this week. Some of the first networks that had signed up for Google's OpenSocial have launched their OpenSocial sandboxes for you to play in.
So add hi5, Ning and Plaxo to your list of OpenSocial-compatible sandboxes, right next to Orkut. We've seen the first (buggy) implementation of OpenSocial on Plaxo and hi5, and we were pretty excited when OpenSocial finally opened its doors.