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The AB refers to the W3C Advisory Board.
Freshly created 2013-06-04, there's an unofficial @W3CAB Twitter account.
It would be great to grant permission to every AB member to post anything regarding AB-related matters.
The methodology is to empower individual responsibility and trust by default, especially in such a small group. This method has worked well with the CSSWG (any CSSWG member may "have the keys" to @CSSWG) and it's been hugely successful in engaging the broader developer community.