@serge For the first issue, I think the work of IFCN and others is helpful. Having qualified fact-checkers that follow industry norms and that are reviewed by peers gives much less of a chance of abusive and misleading fact check annotations. Of course, in a federated system there's no way to *make* people use those services instead of biased and untrustworthy ones, but I think it's possible to use the brands and organizations as a quick filter.