An implant is disclosed and can include a body and a plurality of pellets disposed within the body. In accordance with the invention outer engagement dowels are mounted at the side edges of the vane to cooperate during a specific period of time, as the only engagement dowels with the downstream support wall in order to take up said shearing forces, whereby tensile stresses will arise in the downstream end portion of the vane in the cross machine direction. In some implementations, a prediction model is used to determine a predicted engagement score, which is an approximation of the predicted level of engagement with the social media message by the other users.