Well. Politics is the mind-killer. Surely such a fact-checking site would be prone to all the hacks politics can master to ''limit'' its effect. Wikipedia and Vroniplag are good (real: illustrative) examples of this.

Whether I have ''hope''? My post wasn't about hope but intended to point out structures with 'critical mass' that did have an effect. One can learn from that. How to build on these, tweak their logic to maybe achieve a better result.

A critical mass is in my opinion always needed to have any noticable effect because local uncoordinated effects are dealt with by self-stabilizing effects of the existing norms (politic powers can use e.g. regression toward the mean, coordinated salami tactics, fogging and noise).