Abstract: A method for information spread in one or more social networks, the method may include receiving or generating social network information that represents members of the one or more social networks and links between the members; repeating, for each point in time out of multiple points in time, the steps of: determining, in response to budget constraints and current statuses of the members, and the current influence vectors of the members social circle, at least one target member that is non-infected during the point of time and should be infected before the next point in time, to provide an increase in the final number of infected members; wherein the statuses of the members comprises (i) infected and infectious, (ii) non-infected and (iii) infected and non-infectious; and sending, at a cost, the information to the at least one target member, before the next point in time.