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how can someone stay knowledgable of all of the many reports and standards on w3.org? Do people visit there regularly?

I tried looking for websub on w3.org without using a search engine and it was a challenge (finally found it)

I found out about this standard myself indirectly during a web search. As an outsider to the w3.org process, I think the best way is to follow working groups with themes you're interested in: https://www.w3.org/Consortium/activities. For example, WebSub is worked on by the Social Web Working Group: https://www.w3.org/TR/tr-groups-all#tr_Social_Web_Working_Gr....