5. The method according to claim 1 , wherein computing a participant score of one of the online participants comprises computing a function S=S val +(1−S rare ), which is accumulated for all the information items contributed by the one online participant, wherein S val is a first function, that determines a number of the information items that were contributed by the one online participant and which were validated by more than three other online participants; and S rare is a second function that retrieves a total number of times that one of the information items was mentioned by the online participants.
5. The method according to claim 1 , wherein computing a participant score of one of the online participants comprises computing a function S=S val +(1−S rare ), which is accumulated for all the information items contributed by the one online participant, wherein S val is a first function, that determines a number of the information items that were contributed by the one online participant and which were validated by more than three other online participants; and S rare is a second function that retrieves a total number of times that one of the information items was mentioned by the online participants. 6. The method according to claim 5 , wherein the first function and the second function are normalized functions having values ranging from 0 to 1.