> I've not heard of people tricked to give them away. People can be tricked to give anything away. > In practice they are no good for verifying humans on blog

> I've not heard of people tricked to give them away. People can be tricked to give anything away. > In practice they are no good for verifying humans on blogs and the like though because only about 0.0003% of humans have one. Even if every human had one it'd still be useless.