Yeah, I'd be afraid of the crowdsourced "endorsements" turning into totally bland stuff as a result. What I specifically want are "facts", i.e. things which are objective and can be verified/falsified. No one will post those about their friends if they are anything but positive.

So the natural consequence is assuming the absence of a verified fact for "is under 300 pounds" is "is over 300 pounds" with equally high certainty, if you have a well structured system which covers everything.