Social Web Working Group
The Social Web Working Group (AKA Social Web WG or Social WG) was a W3C Working Group that was chartered with developing specifications (including IndieWeb specifications) for the social web, based on the outcome of the osfw3c workshop in 2013-08. It was active from 2014-07-21 to 2018-02-13, some work has continued in the Social Web Community Group, and all IndieWeb related specifications continue to be developed in the IndieWeb community.
Social WG IRC
The Social Web WG used the #social IRC channel on the W3C IRC network (irc.w3.org). It's the best place to catch up on discussions and meeting (telcon, face-to-face) interactions: