If we think of them as a kind of centrally administered boycott then
it's practically a grassroots political kind of activity. Is that kind
of thing often codified in IETF docs? Would the IETF produce, e.g.,
BCPs for running Wikis or Blogs?
I am not addressing the political aspect of your question, only the
blogs/wikis one. Blacklists are used on an Internet-wide scale between
multiple systems, and can be within the scope of the IETF. Blogs and
Wikis generally do not interoperate with other systems and are not
necessarly in scope. However, the inter-system parts of the blogs such
as RSS may be within IETF scope as demonstrated by the existance of the
ATOM list at IMC.