Allow others to damage your reputation as a grant
Negative comments on profiles can be a way for building trust in a network, but you explicitly (and not only implicitly) allowing them to comment negatively, already adds value to the negative comment and avoids problems of discomfort or brusqueness both for the one who gives the negative comment and for the one who receives it.
In the Own grants model, you specify for how long and in what way the compensatory damage can be caused to your reputation by the other party. i.e.
«I allow you to use with my bike, insult me and tell my groups and friends and put slanderous posters down the street, but only until a day after I have returned it to you»
«I don’t know you and you ask me for staying in my house and I have to trust you. So to have a more fairer relationship you should trust me too in allowing me to damage your reputation if you do not comply with what we agreed to. It’s not fair if you do not let me to maybe hurt you while i have to maybe let you hurt me»
«Your cousin (user1) also offers you an OwnTrust if you need it»
See also: Trustful code (old specification document)