Nico: “In the days of Usenet you could use a killfile.”
You can do that on the web too. Imagine a killfile service, to be set up beside OpenID services. This service will accept as input the OpenID of anyone needing to be put in the killfile, and will output, on demand, an JSON string of the contents.
If you want to set up a server-based filtering system, it’ll require more work, but it can be done.
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