The Salmon protocol provides for aggregating comments across sites. If a site that syndicates a feed receives a comment on an item in that feed, it can re-post the comment to the original source.
Ikiwiki does not allow comments to be posted on items it aggregates. So salmon protocol support would only need to handle the comment receiving side of the protocol.
The current draft protocol document confuses me when it starts talking about using OAuth in the abuse prevention section, since their example does not show use of OAuth, and it's not at all clear to me where the OAuth relationship between aggregator and original source is supposed to come from.
Their security model, which goes on to include Webfinger, thirdparty validation services, XRD, and Magic Signatures, looks sorta like they kept throwing technology, at it, hoping something will stick. --Joey