Agents choose whether or not to join a protest, their decision depends on who else is going, that is they have a (private) threshold. They do not observe everything, but they have some (unprecise) information about the thresholds of others. Over time, they will use this information and their observation about who else is going to rule out some possible worlds. It is shown how the diffusion dynamics can be manipulated when changing the thresholds or the beliefs about thresholds.